Communication issues between SEP client and SEPM after installing Internet Explorer v.7 in environment using a proxy server.

Products

• Endpoint Protection

Issue/Introduction

After installing IE7 on XP Pro SP3 workstations, communication between SEP MR3 client and the SEPM is lost. This is specifically in an environment using a proxy server.

Symptoms:

• After installing IE7, no green dot on SEP icon. Server displays as 'Offline'
• Secars test returns ‘OK’
• Sylink.log indicates the following when connecting to SEPM IP address:

Throw Internet Exception, Error Code=997;AH: failed to end request...

EVENT_SERVER_DISCONNECTED, return=0

• Sylink.log indicates the following when connecting to SEPM host name:

HTTP returns status code=404

• Internet connectivity, email, and shared resources all access normally
• Re-installing IE6 restores communication

Cause

Several possible issues:

• Proxy settings from IE6 were not retained following install of IE7
• Internet Options/Advanced continue to use HTTP 1.0 instead of HTTP 1.1
• Windows Registry retains legacy setting for the following key: HKU\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections

Resolution

• Verify proxy settings from IE6 were retained following install of IE7
• Verify Internet Options/Advanced for IE7 include the following:

                   Use HTTP 1.1
                   Use HTTP 1.1 through proxy connections

• Delete HKU\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections

                  Connections key is recreated at reboot

Also, it may be needed to disable the IE functionality if "autocaching" see the following article for information from Microsoft:

http://support.microsoft.com/kb/271361