Monday, October 4, 2010

Cisco VPN Client and Network connection issues

If you are having network connection issues and you have Cisco VPN client installed, try stopping the Cisco Systems, Inc. VPN Services. This service seems to conflict with certain LAN protocols.

Specifically, the ongoing issue I have experienced is with EMC Retrospect backup client and the Cisco VPN service. The workaround is to simply stop the Cisco VPN service, allow the backup to complete, then restart Cisco VPN. I believe it has to do with the Piton network protocol that Retrospect client uses because I don't have any other issues except for Retrospect backups.
Here are the specifics:
  • OS Windows XP Pro SP3
  • Retrospect Client version 7.0.107 (more recent versions have the same issue)
  • Cisco VPN Client version (more recent version have the same issue)

Wednesday, September 8, 2010

ESET NOD32 and blocked HTTP requests

Users complaining they do not have internet access and cannot POP their email from server. Turns out network connections are fine (can ping, telnet, ftp etc) but all HTTP and SMTP requests were blocked. First thought, there is a nasty virus or malware lurking around the network. But no... turns out NOD32 (our virus and spyware protection software) was the culprit itself. In order to provide it's "Web access protection" and "Email client protection" it creates a local proxy to filter all requests. Well, somehow (yet to be determined) the proxy was hung or crashed in some way that blocked all Http and SMTP requests. For most machines, this was fixed with a simple restart of the computer, others, NOD32 had to be reinstalled.
While I dont yet have a firm solution to the problem or a determination as to what triggered it, I do know that at the time of the NOD32 issues, our central NOD32 server was very slow and nearly non-responsive. Why that would cause clients to hand, idk, but at this point, it is the only indication of a possible trigger.

I will follow up with any new solutions. Please post here if you have more info. Thanks.

We are currently running ESET NOD32 on Windows XP sp3 clients.