ISA 2006/TMG 2010 Link Translation: Replace Something With Nothing

Published on Monday, September 19, 2011 in ,

Recently I assisted a colleague in a case where they had to publish some web service using ISA 2006. Now the problem was in fact that their was a lot of legacy code/folder structure and for the publishing to work we had the following mapping configured:

Jep, that does include dots in the 2nd level folder… Basically if you retrieved an URL like http://www.publicurl.com/homepage.html it would contact the internal webserver at http://srvweb01.custdom.local/www.customer.com/homepage.html The problem we were seeing is that some of the returned HTML page still contained paths like <script=”/www.customer.com/scriptresource.axd?aze232LKJ22LJ”. So that problem is the explanation of this post. We wanted to replace /www.customer.com with nothing. ISA was configured to add that path to internal requests anyway…

The translation table on which ISA/TMG base their logic is built from the mappings specified by the publishing rule. But one can add as many custom translations as desired.


Now if you take the link translation tab, you can click the Mappings button. You’ll see all the mappings ISA is currently maintaining. They were all preceded by http://srvweb01.customer.local We wanted to add a mapping which replaced /www.customer.com with “” [nothing]. We really just wanted to get rid of it… However in the to field you are obliged to enter something… So TechNet to the rescue! I posted my question up on the forums and got some good tips really fast: ISA 2006:Link Translation: Replace Part of path with nothing

Tip #1: replace  ="/folder  with  ="/ 

Tip #2: replace /folder with /.

I’m not sure which options my colleague tested, but he reported back that a small variation, namely “”/www.customer.com" with “”. Only use what’s between quotes, including the leading “.

Thanks Kai and f3rrix!

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