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ISA Denies the uniform Resource Locator

By surveymaster.shivaram ·
Paychex software installed on one of the computer behind firewall. It is a web based application. After Username and password entered it pops up the following Message.
Unable to connect to Paychex Proxy Returns "HTTP/1.1 502 Proxy Error (ISA Server denies the specified Uniform Resource Locator (URL). )

Steps too to resolve this problem
* Installed the software on different computer still the problem same
* Checked for paychex website blocked
* it is not blocked
* uninstalled Web Proxy client. It did not help.
* ISA Management-IP Filter- Created new filter to this allow outbound to any. It did not helped

I checked with Paychex support. They said they application use HTTP and SSL protocol port 80 and 443. We have not blocked port 80 and port 443. We other java based application working fine. What could be the problem. Please guide me.

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by CG IT In reply to ISA Denies the uniform Re ...

Microsoft's Help and Support site, article # 283285 Blank Page or Page can not be displayed when viewing SSL sites through ISA server I believe addresses the problem your having.

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