An Internet filter is hardware or software that restricts the information that is delivered over the Internet. Although i am not a hundred% certain on the reasoning behind the answer however i might infer that could be this block will drive the consumer machine proxy to use default credentials to connect to the web server. Although he is ready to click on the internet service URL and he sees the methods in our web service. Create a new protocol definition with the next settings: Protocol: TCP; Direction: Outbound; Port: 80. Disable the Web Proxy filter for this protocol, as described in Appendix A: Disable the Web Proxy Filter later on this document. The HTTP protocol can be used by applications to encapsulate their specific protocols into the HTTP or HTTPS protocol.
Problem: A Web request from the ISA Server laptop to a useful resource on the Internal network fails with Error 12209: ISA Server denies the specified Uniform Resources Locator. ISA Server has a Web chaining rule configured, to direct traffic upstream to the second Web Proxy utility on an alternative port (for example, port 8082). In some circumstances, applying NAT to traffic passing by means of the Web Proxy filter may cause surprising results. The HTTP Filter in Forefront TMG is rule particular except the Maximum Header length setting. With this setting in place, ISA Server intercepts requests from SecureNAT and Firewall shoppers, and passes them to the Web Proxy filter for clear dealing with. Cause: ISA Server intercepts the VPN client request and redirects it to the Web Proxy filter.
The technet article I discovered the web proxy filter work around, says : The disadvantage of this workaround is that outbound HTTP requests from SecureNAT and Firewall shoppers will then go on to the Web server instead of being redirected to the Web Proxy filter.
The HTTP Filter in Forefront TMG is also succesful to filter HTTPS site visitors utilized in reverse web server publishing scenarios the place HTTPS Bridging is used and for outgoing HTTPS requests when the HTTPS inspection feature of Forefront TMG is activated.
It makes no sense because it should not be going by means of the proxy to get to this server. The drawback of this workaround is that outbound HTTP requests from SecureNAT and Firewall shoppers will then go directly to the Web server as a substitute of being redirected to the Web Proxy filter. I have learn the documents, I’ve deployed a pair ISA servers earlier than and by no means had this form of trouble.