Zero Trust Applications - Forbidden/403 Errors (Browser Related)

Just a heads up for the community.

Starting this morning we started seeing 403/Forbidden errors for all of our internal Zero Trust Applications that are served over cloudflared tunnels. Nothing had changed with policies, etc.

After a bunch of troubleshooting, we determined the issue, (at least for us), was down to Chrome and Safari: Firefox works without issue, and is our workaround for now.

An urgent ticket as been created, but just in case anyone else is seeing similar issues within the past 12-24 hours, give Firefox a try.

This post from earlier today is what got me thinking it was browser-related, (though it’s still not resolved for us):