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Monitor your IP address in TMG and see which rules is blocking this.
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Monitor your IP address in TMG and see which rules is blocking this.

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Thanks for the suggestion from Sikhumbuzo
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Thanks for the suggestion from Sikhumbuzo

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For some reason access to YouTube was restored after a while. It was probably patch related since we did not need to make any changes to our rules since even initially, YouTube access was not blocked.
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For some reason access to YouTube was restored after a while. It was probably patch related since we did not need to make any changes to our rules since even initially, YouTube access was not blocked.

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For some reason we are not able to view youtube videos on the LAN. I do not have any rule blocking this content, but it just seems to have started suddenly a short while ago. We are running a Forefront TMG 2010 firewall.
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For some reason we are not able to view youtube videos on the LAN. I do not have any rule blocking this content, but it just seems to have started suddenly a short while ago. We are running a Forefront TMG 2010 firewall.

Unable to open a YouTube Video

Microsoft Forefront, formerly known as Internet Security and Acceleration Server (ISA Server), is a network router, firewall, antivirus program, VPN server and web cache that runs on Windows servers. It includes identity management and protection systems, and discontinued systems for threat management and network protection, along with protection for Sharepoint and Exchange. The scope of discussions includes forward and reverse proxy, application and service publishing, virtual private networks (VPNs), outbound access rules, SSL certificates and network routing within either a single node or an highly-available array pairing.