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Web Proxy Clients fail to browse Internet sporadically

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Web Proxy Clients fail to browse Internet sporadically - 28.Jun.2011 9:40:18 PM   
pjscott13

 

Posts: 23
Joined: 12.Nov.2007
Status: offline
Hi There,

We are running ISA Server 2006 on a Windows Server 2003 box. We have had this server configured and working perfectly fine for the last 3 years without issue. We are currently planning the upgrade of this server.

The issue that we have faced in the last couple of weeks is that every now and then we will come into the office in the morning and all web proxy clients will be unable to browse the internet. There appears to be nothing wrong with the ISA server box and no errors are reporting in the Event logs or in the ISA server alerts/logs. To resolve the issue we have to restart the server and everything will be back to normal until the next time this issue occurs.

We can also work around the issue by removing the Proxy Settings from the Web Browser, however this is not an ideal solution in our environment.

I have searched and searched for similar issues and have come across nothing. Can any one provide any assistance in helping us troubleshoot this problem further? Surely there is some detailed logging we can use to workout what is causing this issue.

Any help would be greatly appreciated!
Phil
Post #: 1
RE: Web Proxy Clients fail to browse Internet sporadically - 5.Jul.2011 10:41:18 AM   
paulo.oliveira

 

Posts: 3472
Joined: 3.Jan.2008
From: Amazon, Brazil
Status: offline
Hi Phil,

is there any relevant logs? Is there any third-party software installed on ISA firewall (backup agent, AV, add-on)?

Regards,
Paulo Oliveira.

_____________________________

Microsoft Premier Field Engineer (PFE)
Blog: http://poliveirasilva.wordpress.com/
Twitter: https://twitter.com/poliveirasilva

(in reply to pjscott13)
Post #: 2
RE: Web Proxy Clients fail to browse Internet sporadically - 5.Jul.2011 6:45:34 PM   
pjscott13

 

Posts: 23
Joined: 12.Nov.2007
Status: offline
We can find no Errors or even Warnings in any logs prior to the outage occurring. The only 3rd party apps we have installed on the server are AV (Trend Micro) and Backup (Backup Exec). Again there are no errors in these logs either.

I am running out of ideas with this issue :-(

(in reply to paulo.oliveira)
Post #: 3
RE: Web Proxy Clients fail to browse Internet sporadically - 8.Jul.2011 4:16:33 PM   
paulo.oliveira

 

Posts: 3472
Joined: 3.Jan.2008
From: Amazon, Brazil
Status: offline
Hi,

make sure you have excluded important folders from antivirus inspection: http://technet.microsoft.com/en-gb/library/cc707727.aspx

Do not run backup one day for tests purposes, it might be locking some file that ISA is trying to use it (like cache file).

Regards,
Paulo Oliveira.

_____________________________

Microsoft Premier Field Engineer (PFE)
Blog: http://poliveirasilva.wordpress.com/
Twitter: https://twitter.com/poliveirasilva

(in reply to pjscott13)
Post #: 4
RE: Web Proxy Clients fail to browse Internet sporadically - 11.Jul.2011 8:40:24 PM   
pjscott13

 

Posts: 23
Joined: 12.Nov.2007
Status: offline
Thanks for the update. I have just checked our AV server and noticed that all the exclusions that I had setup when we first configured the server have now disappeared. I can only put this down to an update of our AV wiping these settings. Nevertheless, the exclusions have been re-added. I have also opened a case with Microsoft for further assistance. We are now waiting for the next occurrence of the problem.

(in reply to paulo.oliveira)
Post #: 5
RE: Web Proxy Clients fail to browse Internet sporadically - 12.Jul.2011 7:56:33 AM   
paulo.oliveira

 

Posts: 3472
Joined: 3.Jan.2008
From: Amazon, Brazil
Status: offline
Hi,

great! Keep us updated!

Regards,
Paulo Oliveira.

_____________________________

Microsoft Premier Field Engineer (PFE)
Blog: http://poliveirasilva.wordpress.com/
Twitter: https://twitter.com/poliveirasilva

(in reply to pjscott13)
Post #: 6

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