MS Teams disconnections - only in one Office behind FG90G

[RolandBaumgaertner72]

Hello,

thats a strange issue we have some time now after updating from FG81E to FG90G and it also only happens in one office. It is true, that there are main users (max 40) using Teams.

Before with the FG81 we didnt have the problems. Now we use SD WAN for the FG90G and implicit SD WAN rule with Volume and 99% using our Internet Access A.  Though we have also above a SD WAN Rule with destination Microsoft-Skype_Teams, Microsoft-Teams.Published.Worldwide.Optimize and Microsoft-Teams.Published.WorldwideOptimize.Allow for Internet Access A.

We tried with dedicated Firewall Policy with ALL services and no Security Profile for these 3 destinations - with no better results.

Than  we tried to Bypass our DoS Policy with new policy above to only Monitor Teams UDP Ports (3478-3481 - 49152-65535) - with no better results.

Only disabling the DoS Policy for out Internet Access A seems to solve the problem but since I dont want to have no DoS on this interface what can we do?

Thanks!