I have just setup the 2006 ISA server as a web proxy. It seems to be blocking certain websites, for instance, this site. I have a webproxy rule setup to allow HTTP, HTTPS, FTP, but i revieve the following error on some sites...
Error Code: 502 Proxy Error. The ISA Server denied the specified Uniform Resource Locator (URL). (12202)
Has anyone else seen this yet? I can access msn.com, espn.com, drudgereport.com, but cannot access ISAserver.org, MSExchange.org. Maybe ISA doesn't want me to view technical websites Any help would be great appreicated.
Sorry for the delay in the answer, Iīve been trying to discard the HTTP filter as the cause of my trouble. I disabled it.
Now I think that the cause can be the Automatic detection settings for FW client. I have added WPAD entry in DHCP with a value http:\\proxyserver\wpad and have a DNS entry for proxyserver pointing to my ISA. It is working properly in other ISA servers in my domain.
For the ISA server with the error, only works if I uncheck automatically detect setting and use the script; and so only checking the third option (Use a web proxy server).
The error 12202 still is related to my "Full Outbound rule".