unable to Access certain Websites using TMG/ISA

We use TMG 201o and ISA 2006. Also we have a Linux squid proxy.

Certain website most with .gov sites(www.guidelines.gov,http://www.uscg.mil/ ) does not work with TMG. but these all working fine with Linux Proxy.

Also it works fine the ISP proxy .

Any Ideas or thoughts would be appreciable?

• Edited by Bibin_Wilson Monday, February 24, 2014 1:24 PM

• unable to Access certain Websites using TMG/ISA

  We use TMG 201o and ISA 2006. Also we have a Linux squid proxy.

  Certain website most with .gov sites(www.guidelines.gov , https://hls.hehealthcare.com/) does not work with TMG. but these all working fine with Linux Proxy. Also works with ISP proxy server.

  Any Ideas or thoughts would be appreciable?

• Merged by Quan GuMicrosoft contingent staff, Moderator Tuesday, February 25, 2014 2:33 AM the same

Can someone please reply for my post please

Look in your logs.

Usually it is failing the https scanning and you have to make an exception.

hi,

As Joe mentioned, please check your TMG live logging when you access the website failure.

Best Regards

Quan Gu

Yes I have checked the logs and it shows denying this traffic.

Please find the attached screenshot of this.

Could any help on this. The funny thing is it is working fine with our Linux proxy server and if I use our Etisalat ISP proxy server( We are at United Arab Emirates).

Please help!!!

Thank You,

Bibin.

 

One of the first things you want to try is if you can get to these same sites on TMG itself. Create an Access rule that allows HTTP and HTTPS from Localhost (TMGs network adapter) to Anywhere (it's under Computer Sets). Apply it and then make sure that IE is not set to use anything for a proxy. Clear all the boxes. Can you browse these sites? If not then your proxy clients will not be able to. Open a command prompt and use nslookup to see if TMG is resolving the sites. Remember that proxy clients rely on TMG to do the name resolution for them. If it is not working then you will have a problem.