The encapsulation across WAN thru GRE, and additional overhead from these clients apps appears to be hitting a threshold that needs to be increased, or MTU decreased if fragmentation is supported. Have you provided Tech Support with your network tunneling equipment details so our QA can try to replicate? If they can't reproduce, can you show them your interface info?
Hi Edwin/Edge, We came across something very similar with our public wifi deployment and I was wondering how this case worked out for you?
Currently we're investigating configuration to check if fragmentation is currently allowed by the AP and how to enable it if not - on our firewall/NAT appliance (Cisco) we also enabled a feature to adjust MSS in TCP to 1300 (aggressive just for testing).