Try block port 80,443,53 on L3 rules. create group policies name internet access and allow 80,443,53 for the user to access the internet. Group policies override L3 rules. content filtering can be customized here too. ... View more

I solved it by changing the client tracking from mac address to ip address. ... View more

Hallo, i have found the following statement about a UDP timeout: https://documentation.meraki.com/zGeneral_Administration/Tools_and_Troubleshooting/VoIP_on_Cisco_Meraki%3A_F.A.Q._and_Troubleshooting_Tips The MX does have a simple UDP timer function, which will drop a traffic flow after an extended period of inactivity. This timer cannot currently be changed. However, a timeout would require both peers to be completely silent for an extended period of time in order to take effect. UDP communication between peers on an active call, for example, is highly unlikely to be dropped due to a timeout. is this may be causing the error? ... View more

Finally, it was a problem with our internet provider. Everythings works fine now. ... View more