Microsoft TMG with IE9 gives script error

During the installation of a fresh Windows Server 2008R2 machine with IE9 and TMG i ran into a nice script error.

Microsoft advises to use Windows Updates during the install of TMG, so after a handfull of reboots i also installed Internet Explorer 9, since we wanted to machine to be completely up to date.
After the installation of TMG i got the following error screen:
ms-tmg-error-ie9-01

It’s a nice error message, but i can’t make something out of it, so just click yes.
Then the next message showed :

After clicking Continue … the TMG MMC is empty…

After some research i found a Microsoft forum thread about this problem and allthough you could uninstall IE9 … i tried this:

Open  %Program Files%\Microsoft Forefront Threat Management Gateway\UI_HTMLs\TabsHandler\TabsHandler.htc with notepad (as administrator).

Go to line 354, 360 and 367 and add some forward slashes before m_aPages, like the screenshot…

Save it and restart the TMG mmc and it should open normally.

Source: microsoft.com

 

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