Web Proxy Client WPAD Autoconfiguration Fails

by [Published on 16 June 2011 / Last Updated on 16 June 2011]

“…Recently I received a call from a customer who was trying to resolve an issue where all web proxy clients that were configured to use Web Proxy Auto Discovery (WPAD) with DNS suddenly stopped working. We began troubleshooting by confirming that the hostname WPAD resolved to the internal IP address of the Forefront TMG firewall, which it did correctly. Next we used a telnet client to confirm that the TMG firewall was listening on TCP port 80 (used by TMG for DNS WPAD clients) and indeed it was responsive. A scan of the event logs on the firewall turned up the following warning message:…

For the rest of the article, please visit:

http://tmgblog.richardhicks.com/2011/05/23/forefront-tmg-2010-web-proxy-auto-detect-fails/

HTH,

Deb

DEBRA LITTLEJOHN SHINDER
MVP (Enterprise Security)
“MS SECURITY”
dshinder@isaserver.org

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