Problems loading website: www.nih.gov

I am having problems loading a particular website at home via vividwireless. I have no problems at work (with another service provider) and can access the website via my mobile phone. It seems to be getting blocked for some reason. The following message appears:

Oops! Google Chrome could not find www.nih.gov
Try reloading: www.­nih.­gov
Additional suggestions:
Access a cached copy of www.­nih.­gov
Search on Google:

I can't load with firefox either.

The website is:
http://www.ncbi.nlm.nih.gov/pubmed

Any ideas why this site is getting blocked and how I can resolve it?

Comments

#1

Frosty-MODERATOR wrote 5 years ago

Using my ADSL service at home I can access it OK.
Can anyone else please test using their vividwireless connection and confirm/deny whether its accessible?

If not, it could be a routing problem upstream from vividwireless, but need some confirmation from a few people before I go hassling the network engineers!

#2

ozzcaddy-MODERATOR wrote 5 years ago

No problems loading NIH using Vivid on a IE 8 browser.

A friend in the USA who uses Chrome had problems the other day. His solution was deleting the cookies.

#3

adlopresti wrote 5 years ago

I am at work right now and the website is loading fine on my computer using Chrome and firefox. I use my laptop both at home and work so the computer is the same. Only the location and the internet provider is different.

#4

Morgan wrote 5 years ago

This website does not work on IE9.0.8 64bit and 32bit or Firefox 13.0.1 (latest) for me on a Vividwireless BM358 HUAWEI USB modem. Takes me straight to "Problem loading page / IE cannot display the webpage" typical connection error, no load time.

EDIT: This was with both browsers with cleared caches / cookies. I tried different security/privacy settings, no go. No log or notifications from firewall / web protection software.

#5

Frosty-MODERATOR wrote 5 years ago

Odd. Could possibly be a routing issue ... ozzcaddy is in Sydney, whereas I am assuming that the rest of you are in Perth. I will see what I can find out.

#6

Meure wrote 5 years ago

Here's a trace route through Westnet in Perth, if you want to compare.

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Users\x>tracert nih.gov

Tracing route to nih.gov [137.187.25.43]
over a maximum of 30 hops:

1 <1 ms 1 ms 1 ms BoB.HuntingClub [192.168.1.1]
2 18 ms 17 ms 17 ms nexthop.wa.iinet.net.au [203.215.5.244]
3 20 ms 18 ms 36 ms te7-1.per-qv1-bdr1.iinet.net.au [203.215.4.18]
4 69 ms 69 ms 69 ms te4-4.ade-pipe-bdr2.iinet.net.au [203.215.20.20]

5 72 ms 72 ms 71 ms po4-100.ade-pipe-bdr1.iinet.net.au [203.215.20.1
37]
6 69 ms 68 ms 69 ms te6-4.mel-pipe-bdr1.iinet.net.au [203.215.20.18]

7 71 ms 71 ms 71 ms xe-0-1-0-0.syd-ult-core1.iinet.net.au [203.215.2
0.102]
8 66 ms 66 ms 66 ms unknown.telstraglobal.net [134.159.126.189]
9 68 ms 66 ms 66 ms i-0-7-1-0.sydo-core02.bi.telstraglobal.net [202.
84.223.1]
10 213 ms 213 ms 213 ms i-0-2-0-0.1wlt-core01.bx.telstraglobal.net [202.
84.140.21]
11 215 ms 215 ms 215 ms i-2-2.tlot03.bi.telstraglobal.net [202.84.251.18
9]
12 241 ms 293 ms 240 ms eqix.lsan.twtelecom.net [206.223.123.36]
13 308 ms 308 ms 308 ms ash1-ar4-xe-0-1-0-0.us.twtelecom.net [66.192.241
.26]
14 * * * Request timed out.
etc.
23 ^C
C:\Users\x>

#7

Frosty-MODERATOR wrote 5 years ago

Early opinion from a source I trust is that it is indeed likely to be a routing issue. Someone O/S is blocking traffic from IPs originating from vividwireless. They are going to try to make contact with that ISP and get the block removed.

#8

ozzcaddy-MODERATOR wrote 5 years ago

FYI... I am still able to access both the websites in question nib.gov and the ncbi... As Frosty already mentioned, I'm in Sydney using Vividwireless.

#9

Frosty-MODERATOR wrote 5 years ago

Here's something you will want to check up on:

http://ip-blacklist.e-dns.org

The guys at vivid looked up your IP address (180.216.51.86) and it showed that IP has being listed in 6 IP Blacklists.

Either your PC has virus/spam problems and is sending out junk emails, or you have picked up an IP address previously used by someone else's PC that has been compromised.

Suggest that you need to virus/malware scan your machine. If infected, fix it. If NOT infected, then within a few days these IP blacklist entries should clear of their own accord. Fingers crossed.

#10

sdkhot wrote 5 years ago

The NCBI site does not seem to work on any devices I have from Vivid. I checked my landlords router and its still bad.
What can be done about this?

I need this site to work at home, so that I can complete a project.

Any suggestions.

#11

sdkhot wrote 5 years ago

Tried using my vodafone 3g and the site works just fine.

Perth is probably affected by this problem.

#12

Frosty-MODERATOR wrote 5 years ago

OK, the other possibility is that a whole range of IPs have been blocked by an ISP on the other side of the Pacific. I will chase this up with vivid and ask them again to look into that possibility. Be advised that this could take days, weeks or even months, depending on how cooperative the other ISP will be.

It could still be the blacklist entries though. Have you checked to see whether the IPs of your modems are listed there? I'm told in some cases it can take 2-3 weeks for blocks to be removed after a spam event is detected.

As a workaround, you could try a proxy service? I am not familiar with what's curently on offer, so don't know which ones are safe to recommend. Can anyone else offer any suggestions?

#13

Frosty-MODERATOR wrote 5 years ago

Would some of you who are unable to access that site please post:

* date/time of access attempt
* MAC address of your modem
* your IP address

Thanks,
Steve.

#14

clarksonbod wrote 5 years ago

I am blocked from www.ncbi.nlm.nih.gov as well. Extremely irritating! I need this for work.

I am in Clarkson, Perth.

#15

clarksonbod wrote 5 years ago

My IP is 180.216.nn.nnn

and the blacklist showed:

Warning! This IP is listed in 5 DNS blacklists.
LISTED 100ms nsZones.com SBL+Dyn
LISTED 111ms nsZones.com Dyn
LISTED 38ms SenderScore
LISTED 89ms Spamhaus PBL Policy Block List
LISTED 96ms Spamhaus ZEN Combined Block List

The IP listed a couple of posts above showed:

LISTED 114ms nsZones.com Dyn
LISTED 113ms nsZones.com SBL+Dyn
LISTED 762ms D. D. N. S. B. L.
LISTED 98ms Spamhaus PBL Policy Block List
LISTED 96ms Spamhaus ZEN Combined Block List

#16

ozzcaddy-MODERATOR wrote 5 years ago

Frosty (Moderator) is out of action with the flu, so no idea when he will be responding to posts.

I would suggest contacting Vivid Support and raising the issue with them, even asking for the enquiry to be elevated.

#17

clarksonbod wrote 5 years ago

I can access the site using a proxy, eg hidemyass.com

#18

watermelon wrote 3 years ago

I live in Perth and I also keep getting the message "oops google chrome could not find www.ncbi.nlm.nih.gov". This is happening right now (2/10/2013, at 3.18pm) and has been happening for last couple of weeks every time I try. I need to use these addresses for research for my work so very annoying.
My IP address is 180.216.56.88. My BSID is F7:E4:11:23:97:21. I am not sure what a MAC address is? I have a usb modem, not a home gateway system.

#19

watermelon wrote 3 years ago

Oh, and also, I can't access the blacklist check website http://ip-blacklist.e-dns.org, as both google chrome and internet explorer say "This webpage is not available".

#20

sdkhot wrote 3 years ago

Ncbi website not working again. Is there a issue with Vivid because this is like a routine problem.

On home gateway and vifi.

#21

ozzcaddy-MODERATOR wrote 3 years ago

No problem accessing website from Sydney with Home Gateway.

When was the last time you accessed the website with Vivid modems?

#22

Frosty-MODERATOR wrote 3 years ago

Next time one of these issues comes up, can you try 'ping' and see whether there is any connectivity at all? From the command line:

ping www.ncbi.nlm.nih.gov

Also try this at times when you don't think you are having a problem with a site. This will tell me whether its more likely to be just a web traffic issue, or a DNS issue, or some kind of routing problem.

#23

watermelon wrote 3 years ago

I have been trying everyday for the last couple of weeks and cannot access www.ncbi.nlm.nih.gov at all. I tried disconnecting my USB modem overnight for the last 2 nights hoping I would get a new IP address when I reconnected but it didn't work. I called vividwireless and had them check and yes my IP address is blacklisted apparently. I am not sure how to ping www.ncbi.nlm.nih.gov ? Can you please explain how to do this?

#24

watermelon wrote 3 years ago

Results of ping test:

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Users\>ping www.ncbi.nlm.nih.gov -n 20
Ping request could not find host www.ncbi.nlm.nih.gov. Please check the name and
try again.

C:\Users\>tracert www.ncbi.nlm.nih.gov
Unable to resolve target system name www.ncbi.nlm.nih.gov.

C:\Users\>

#25

Frosty-MODERATOR wrote 3 years ago

"could not find host" and "unable to resolve target system name" indicates some kind of DNS issue for starters. That could be as a result of your IP being blacklisted. But in my experience this is more likely to be a router block somewhere upstream.

Is your modem's public IP Address one which starts with 180.216 ... ? (check in the web interface of the modem).

It certainly looks like an upstream routing issue. If you can confirm the IP address, I will have a chat to the network engineers and see if they can prove this one way or another.

Just so you know, even if we can prove that this is what the problem is, it might take days, weeks or even months to resolve, because it involves making contact with other ISPs, usually overseas, and convincing them to remove blocks in their routers.

#26

watermelon wrote 3 years ago

Hi Frosty,

As I posted before my IP address is 180.216.56.88.

It is really inconvenient as I need to access www.ncbi.nlm.nih.gov websites for my work and study. So yes, please chat to the network engineers or whoever you think may know how to fix it.

Thanks.

#27

Frosty-MODERATOR wrote 3 years ago

I used the site here:
http://whatismyipaddress.com/blacklist-check

and found that your IP address was listed in a few blacklists. You might want to start by getting it removed from them while I follow this up on the network end of things.

#28

watermelon wrote 3 years ago

HI, just to let you know I was able to access a www.ncbi site today, so perahps that's cause of what you've done at your end? I checked my IP address and it has changed to 180.216.61.232.

So can I assume its fixed now?

#29

Frosty-MODERATOR wrote 3 years ago

No, I would not assume that its fixed. Nothing to do with what I have done anyway. All I did was email the relevant details to my contacts at vivid. They advised that due to a public holiday, they would not be able to investigate until Tuesday at the earliest.

The change of IP address is probably significant though. I would put it down to that.

#30

sdkhot wrote 3 years ago

Hello again,

I am having the OOPS error and no way to get to the ncbi server. I think perth is having this issue.

Oops! Google Chrome could not find blast.ncbi.nlm.nih.gov

Try reloading: blast.­ncbi.­nlm.­nih.­gov

Sam

#31

sdkhot wrote 3 years ago

date/time of access attempt 7/10/2013 / 11.45 am
* MAC address of your modem : 00:1F:FB:40:12:06
* your IP address:180.216.50.84

Please let me know what is wrong with NCBI being not accessible here at regular intervals.
Regards,
Sam

#32

Frosty-MODERATOR wrote 3 years ago

Thanks sdkhot, I have passed your info along too ...

watermelon: can you post your modem's MAC address too?

#33

watermelon wrote 3 years ago

MAC: BC767008AE0F i think, does that sound right?

#34

ozzcaddy-MODERATOR wrote 3 years ago

That doesn't look like the MAC Address. If you have the Home Gateway, it will be on the bottom (on label) or you can log in to the modems setting and obtain the MAC Address that way.

#35

Frosty-MODERATOR wrote 3 years ago

Righto, I have a pretty definitive answer now on the causes for this issue. The blacklist issue is where you need to focus your attention. Try this site instead:

whatismyipaddress.com/blacklist-check

My contacts in the network team advised as follows about the www.ncbi.nlm.nih.gov site (and this presumably applies to all related sites:

1. it blocks pings, so that makes testing more difficult
2. certain trace hops are invisible (again due to some block at the far end)
3. DNS resolves the site fine
4. different browsers make no difference at all
5. renewing WAN IPs helps sometimes (i.e. getting a different IP address for your modem)

It looks like the Website(s) in question have very strict firewall policies in place. People who are blacklisted are blocked and retained in block for long time.

Vividwireless does NOT block any IP of its users, no matter how many sites blacklist them. So the issue is not at this end of the connection.

Vividwireless will try to contact the website and gauge their response, however right now the website is not attended to because of the government shutdown in USA. Even if/when they respond, they may not choose to change anything at the USA end of the connection.

The problem is IDP systems which certain government and banking sites employ, which use dynamic firewall policies, thus generating false positives ... or THEY become extremely defensive to tcp connections from Blacklisted (or previously blacklisted IPs.

Bottom line: you need to (a) get your modem to use a new IP address (turning it off for an extended period may help with this); or (b) get the IP address that you have removed from as many blacklists as possible.

#36

watermelon wrote 3 years ago

I don't understand much of what you are talking about in that previous post Frosty....

Yep pretty sure MAC: BC767008AE0F is my mac address, its whats listed as my Mac address under the device info.

Today my IP address is 180.216.42.196. This IP address is blacklisted against these sights:

pbl.spamhaus.org

l2.apews.org

zen.spamhaus.org

dyn.shlink.org

It seems my IP address can change daily without me unplugging the modem. It just changes when I switch computer off at night. Considering this, there any point in trying to contact each of the blacklisted sights? Is this what I am meant to try and do? How would I do this anyway? Thanks.

#37

Frosty-MODERATOR wrote 3 years ago

The change of IP address depends on a couple of things:
(1) the length of the DHCP lease issued by the vividwireless system (I thought this was 24 hours, but maybe it is shorter?)
(2) how busy the tower is in your area

Even if the leases are 24 hours, in a very busy area there is a chance that the IP you last used would get re-used by someone else if you have your modem turned off.

Point taken about the blacklist sites. If your IP address is changing a lot you would end up chasing your tail; a lot of effort. My comments were predicated on the idea that the IP address doesn't change much.

However that does open up an alternative strategy, namely, to see if there is a way to force the modem to get a new IP address. So if you are blocked, maybe turning off the modem for an hour or two will help, hoping that someone else will get that IP address, so that you get a 'new' one that is hopefully not blacklisted.

Unfortunately I don't think there is any way you can control that. It would pretty much be pure luck.

Of course, if you do happen to hit an IP address where you DO have access, then maybe avoid turning off your modem?!

#38

watermelon wrote 3 years ago

I did try unplugging modem over a few night to see if this would cause me to get a new IP address but I just got the same one a few days running. While at other times it did switch IP overnight. It seems there is not predictable way to stop this from happening. Anyhow, it is fine today so will leave it for now and have to report back to you if it happens too often and too consistently in the future. Thanks for your help :)

#39

watermelon wrote 3 years ago

Pretty annoyed. Having the problem again today. IP is 180.216.59.114. It seems there is no way to fix this problem! it is really annoying. The issue was escalated with the vivid technical team and they said they couldn't do anything and it was up to me to contact http://www.ncbi.nlm.nih.gov/
But apparently the US is in lockdown so I can't do this and neither can they. And vivid said they weren't planning on contacting me if they did hear from ncbi.

Anyhow, if an IP address is blacklisted before I get it, how is that my issue? Surely then there must be other people having this problem or am I one of only a few vividwireless users tying to access the ncbi site?

Someone please tell me has anyone actually resolved this issue before? I see there were people posting on this thread with the same issue over a year ago. So what happened to their cases? Were they resolved in some way? What about skdhot and adlopresti and clarksonbod?

I really don't see any way of fixing this?? I don't want to have to leave my computer on continuously to avoid my modem shutting down. This is going to cost me too much for electricity! Any real solutions welcome please.

#40

ozzcaddy-MODERATOR wrote 3 years ago

I'm not sure if my problem occurred with ISP- VividWireless or Unwired, when I had a similar problem 3-4 yrs ago. My IP was suddenly Blacklisted by American Airlines, which I had an account with. It took approx. 3 weeks to have the problem resolved. My ISP contacted American Airlines. However, American Airlines is not government owned.

As this website in question is and continues to be effected by the US Government lock-down, the website may not even be managed by tech people.

I just tried the website and the Home page displayed, but with the following Warning:
"The information on this web site remains accessible; but, due to the lapse in government funding, the information may not be up to date, and the agency may not be able to respond to inquiries until appropriations are enacted. For updates regarding government operating status see USA.gov."

#41

watermelon wrote 3 years ago

Thanks for your input ozzcaddy. I get a new IP address nearly every day it seems so I'm not sure what can be done to fix it in my case? I just spoke to vivid again on the phone and it seems there are potentially thousands of IP addresses that may be blacklisted with http://www.ncbi.

I have been told I need to contact http://www.ncbi, but how is this going to fix the issue when I get a new IP address every other day and I am finding they are mostly all immediately blacklisted as soon as I try to use them?

Why is it happening only in Perth also?

May be a silly question. But is there any way for Vivid to check their range of IP addresses and find out which are blacklisted against ncbi?

#42

Frosty-MODERATOR wrote 3 years ago

The reason this is happening more and more is because companies (and government departments) are using more and more sophisticated security mechanisms. Firewalls can now be configured with 'black lists' so that they block traffic from IP addresses which have been known to cause problems in the past ... e.g. spammers.

So this can happen at any ISP and is not constrained just to vividwireless. At some point in the past, someone using your IP address has done something to get themselves blacklisted, so now whoever logs on and gets that IP ends up on any number of black lists around the world.

Vividwireless can't really 'fix it' because the issue is external to them.

You could try to find out which black list provider NCBI use and then try to get your IP removed from that list.

Not really a good situation for you. But I don't see what else can be done. Personally I think this sort of thing is an unwelcome development in security, as it catches too many innocent people.

#43

watermelon wrote 3 years ago

Thanks for your input Frosty. How can find out which black list provider NCBI use?

As I said my IP changes nearly every day and nearly every day they are blacklisted already when I get them. Contacting NCBI and getting them to remove my IP address from their blacklist is not a solution as I would need to contact NCBI every day to get them to remove each new IP I get, wouldn't I?
Still I will try and contact them but if it continues for much longer I will have to change to a different internet provider as I need to access the NCBI journal database for work and study. Perhaps other providers will not have such as issue with their range of IP's being on so many blacklists.

I am going to keep recording my daily IP address here for now.

Today it is: 180.216.51.91 and I cannot access NCBI.

According to http://whatismyipaddress.com/blacklist-check my IP today is blacklisted against the following sites, (same ones as before actually):

pbl.spamhaus.org
l2.apews.org
zen.spamhaus.org
dyn.shlink.org

#44

ozzcaddy-MODERATOR wrote 3 years ago

Watermelon, in regards to the situation that I had experienced (post #40), from memory now, my IP was not blacklisted, but was that American Airlines (AA) had not adjusted their system, to accept a new range of IP Numbers that had been released. So all AA needed to do was to adjust their system to allow those new range of IP numbers.

I know that it does not help you, but just wanted to clarify my experience.

#45

Frosty-MODERATOR wrote 3 years ago

Taking Ozzcaddy's experience into account, I would start by getting the IPs removed from Spamhaus. That is one of the main blacklist providers. I would be 50% confident that this would be where the blocking originates from. If that proves to be correct, then you effectively also answer the question about where NCBI get their blacklist info from. (incidentally, my own mail server uses Spamhaus' blacklist for spam email filtering).

If that doesn't prove helpful, then you might need to query NCBI itself and ask them where their info is obtained from.

I don't think that they will be blocking a whole range of IPs as with Ozzcaddy's experience, because you mention that sometimes you get an IP which works.

Another option for you would be to investigate whether getting a VPN connection would help (a VPN tunnel might be able to hide the traffic's origin from them). Or alternatively, maybe a proxy service would do the trick.

#46

watermelon wrote 3 years ago

Thanks ozzcaddy for your input, so potentially a range of vivid IP addresses may be blacklisted and I am getting that range. Frosty so far there has been only one day in the past month that I have had an IP address that was not blacklisted. Are you sure that a whole range of IP's are not getting blocked? Can someone from Vivid check if this is the case?

So for now you saying that every day when I get a new IP address I should try to contact Spamhaus and get it unblacklisted?

Today my IP is 180.216.53.189 (and I cannot access http://www.ncbi.nlm.nih.gov/)

It is blacklisted against:

zen.spamhaus.org
dyn.shlink.org
l2.apews.org
pbl.spamhaus.org

I will try contacting zen.spamhaus.org today.

#47

watermelon wrote 3 years ago

Ok so went onto zen.spamhaus.org and check my IP and got a page of info which I do not really understand, here is some of it:

Ref: PBL814684

180.216.0.0/17 is listed on the Policy Block List (PBL)

Outbound Email Policy of The Spamhaus Project for this IP range:

This IP range has been identified by Spamhaus as not meeting our policy for IPs permitted to deliver unauthenticated 'direct-to-mx' email to PBL users.
Important: If you are using any normal email software (such as Outlook, Entourage, Thunderbird, Apple Mail, etc.) and you are being blocked by this Spamhaus PBL listing when you try to send email, the reason is simply that you need to turn on "SMTP Authentication" in your email program settings. For help with SMTP Authentication or ways to quickly fix this problem click here.

See also: http://www.spamhaus.org/faq/answers.lasso?section=Spamhaus%20PBL

#48

watermelon wrote 3 years ago

Here is some further explanation in the question and answer section, apparently there is nothing I need to do as the PBL is not a blacklist, just a list of dynamic IP's which includes all of Vividwiress IP's aparently?.

Question: Help! My IP address is on the PBL! What should I do?
Nothing, in most cases. Read through this FAQ for further explanations.

The first thing to know is: THE PBL IS NOT A BLACKLIST. You are not listed for spamming or for anything you have done. The PBL is simply a list of all of the world's dynamic IP space, i.e: IP ranges normally assigned to ISP broadband customers (DSL, DHCP, PPP, cable, dialup). It is perfectly normal for dynamic IP addresses to be listed on the PBL. In fact all dynamic IP addresses in the world should be on the PBL. Even static IPs which do not send mail should be listed in the PBL.

PBL listings do not prevent you sending email unless your email program is not authenticating properly when it connects to your ISP or to your company's mail server. This can happen if you have forgotten to turn on 'SMTP Authentication' or if you have switched 'SMTP Authentication' off by mistake.

If you are using a normal email program such as Outlook, Entourage, Thunderbird or Apple Mail and you are being blocked by a Spamhaus PBL listing when you try to send email, the reason is simply that YOU NEED TO TURN ON 'SMTP AUTHENTICATION' in your email program's account settings. That will solve the problem for you. See: How do I turn on SMTP Authentication?

Server admins who need help with SMTP AUTH can find lots of information for most servers such as Sendmail, Postfix, Exim, Qmail, Exchange, etc.

#49

watermelon wrote 3 years ago

Who should NOT remove their IP address from the PBL?
Most people should not remove their IP address from the PBL.

If you are a home user and you connect to the Internet with cable, DSL, wireless, satellite or dial-up access, you should not remove your IP.

#50

watermelon wrote 3 years ago

So I just checked another blacklist, "12apnews.org", and here is what is recommended on their site:

APEWS is just an automated system, if spam or spam involvement (hosting spammers, selling spamware) from your IP address/range ceases, it will drop out of the list in time. Normally the listing involves spam related problems with your host and the first step you need to take is to complain to them about the listing, in almost all cases, they are the only people who can get an address/range out of the APEWS list. If there is a spam related problem with your host, their IP address/range will not be removed until it is resolved. If your host or network is certain a listing mistake has been made, ask them to read this FAQ on the APNEWS website.

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