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How to resolve 502 Proxy Error, rejected by HTTP filter (12217)

When browsing to various websites users receive the following error:
Error Code: 502 Proxy Error. The request was rejected by the HTTP filter. Contact your ISA Server administrator. (12217)
IP Address: XX.XX.XX.XX
Date: 2/8/2008 4:24:01 PM
Server: server.domain.com
Source: web filter

What can I do for resolve this. Even Hotmail fail.
Microsoft Forefront ISA ServerMicrosoft Server AppsInternet Protocols

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8/22/2022 - Mon

What can I do for resolve this. Even Hotmail fail
Keith Alabaster

Provide the error output from the ISA gui - monitoring - logging.

Sounds like you have shagged the basic configuration - check my article first.

Sounds like false positives when using that HTTP filter, or bad/incorrect coding of websites.

I guess you could create an extar rule which does not use HTTP filtering and then define a URL set that is exempt from the HTTP filtering.

Osama Mansoor
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