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Acess to specific webpages stops working - terminal server

Hi Guys,

I have a Server 2003 Terminal server running for a client of mine. About a week ago, my client calls up stating that he cannot get to specific websites on the internet. I logged in, and he was right. For instance, if I go to www.careerbuilder.com, the page comes up fine. If i click on Login, it says "internet explorer cannot display the webpage."

I tried the following
1) modifying DNS (no other servers in the environment experience this issue)
2) Uninstalling AVG (which fixed it for a time)
3) Rebooting (which fixes it for a time)
4) Resetting all settings in IE to default
5) Making sure all necessary services are started


What could be causing something like this? It makes NO sense.
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tamaneri
Asked:
tamaneri
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2 Solutions
 
tamaneriAuthor Commented:
Forgot to mention.... This happens with Firefox as well, so I know it's not an IE issue....
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theras2000Commented:
Sounds viral.  I've had weird stuff like that happen to me.  Firstly, make sure no weird processes are running, as they could be intercepting your traffic.  Next you wanna see if it is only web traffic or everything.  Try pinging the site to resolve the DNS at multiple times and see if anything changes when it doesn't work.  Try telnetting to port 80 of that site, to see if you can actually open a web connection, when the browsing's not working.  Deifnitely try another browser, to make sure it's not IE specific.
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DarinTCHSenior CyberSecurity EngineerCommented:
are you running any firewalls?
Are you accessing the internet from the server
If so do you have SCW running on the server - higher level security
which blocks everything unless explicitly allowed?
Can you add it to trusted sites?
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tamaneriAuthor Commented:
I am able to successfully telnet to one of the sites in question.

I tried firefox, same thing, page cannot be displayed when I try to sign in @ careerbuilder.com.

I am able to ping the website with no issues, gives me the same IP from any other server.

I had AVG Internet Security Business Edition on the system, I thought it was that creating the issue and has been since removed.

Even with the site added to the trusted sites, it is still inaccessible.

I just ran Malwarebytes Anti-Malware, not a single result was returned.


To me, it seems the issue has to do with specific HTTPS sites. Any other ideas?
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theras2000Commented:
So the key thing is to try the above mentioned before and after it's "broken".  Is it simply a matter of time before it breaks, or is it just as soon as you try to use any SSL page?  Is this when the client is logged on remotely to the Terminal Server, or does it happen when locally logged on too?
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tamaneriAuthor Commented:
It is only on the Terminal Server. The users logging into this terminal server are going over the internet, they are on an entirely separate network.

I believe I have determined the issue is with Websense. I stopped ALL of the Websense services and voila. the issue was resolved. Once started, it still continued to work. Websense is obviously causing some sort of issue here. I may migrate it to another server.
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