Microsoft Copilot is all around...

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  As the debut of Microsoft 365 Copilot approaches, there are a lot of Copilot features set to be introduced across the Microsoft 365 ecosystem. Here are a few noteworthy additions: Microsoft has unveiled a series of innovative features in the upcoming releases of Windows 11, some of them are already released, and some are currently available in preview builds. The Windows 11 Copilot, conveniently located in the taskbar, eliminates the need to open your Edge browser. It is seamlessly integrated with Bing Enterprise Chat (BEC) and ChatGPT, making it really easy to get started on your creative journey. Included in Windows 11 is the new co-creator feature in Paint. This feature, also in preview, is integrated with DALL-E and provides a swift and straightforward method for creating illustrations and images. If you possess a knack for crafting descriptions, you can generate quite impressive imagery. Another AI-powered feature is image creation directly from BEC. This feature, also integrate
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502_3 bad gateway IIS AAR RP for Lync

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I encountered a "new" error message this week, as I was finalizing a Lync 2013 deployment for a customer. When I say new, it was new to me, as I had not seen this before. Everything was set up for remote access and federations, but certain features, such as mobility did not work right away. I decided to test the URL's from the outside, and was surprised to find the following error message:


This deployment was set up with a IIS ARR for reverse proxy. I searched for the 502 (502.3 to be exact) on forums and internet in general, but could not find any answer to my exact issue.

I verified firewall ports and connectivity was ok. I also checked the web sites on port 4443 and 8080 from a client inside, and saw no apparent errors.

I went through the deployment guide one more time (step by step), and discovered I had forgotten to import the internal CA ROOT to the Reverse Proxy machine. Once this was installed, it all worked just fine.

The reason I decided to write this post, is because the root cause was not very obvious to me (only after reading tracing logs and checking the step by step guide again, was I able to figure out the problem). And I wanted to write a reminder to myself, and maybe help somebody else if they happened to forget to import the ROOT CA.

The 502 "invalid response" can be a lot of things. Certificate error being one of them. Now I know.

For those looking for a guide to set this up, I have two links for you:
This is the one I used: http://uclobby.wordpress.com/2013/08/02/configuring-arr-for-lync-server/

And here is one from nexthop: http://blogs.technet.com/b/nexthop/archive/2013/02/19/using-iis-arr-as-a-reverse-proxy-for-lync-server-2013.aspx

I preferred the first one, as it was a more "general" rule to catch all. But it might not suit all scenarios. The one from nexthop is much more detailed, and will have you set up a rule for each URL.

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