Exchange 2016 Outlook Anywhere

We are experiencing some issues with Outlook Anywhere going through Cloudflare. External clients can get to our owa site just fine. Once we bypassed Cloudflare Outlook Anywhere clients connected as expected.

We are unsure what we need to do to make this work.

Are there any issues with Outlook anywhere and Cloudflare?

Are there any config items we need to change?

Is this supported?

After some quick googling, Outlook anywhere looks like it might need ports 6001 for RPC, which isn’t proxied by Cloudflare.

Port 443 is the only open port requirement for Outlook anywhere.

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