Can you try reducing your MTU to 1320 or 1280 in the app?
Also, apply this iptables rule in the ProxyVM:
sudo iptables -t nat -I POSTROUTING 3 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
Can you try reducing your MTU to 1320 or 1280 in the app?
Also, apply this iptables rule in the ProxyVM:
sudo iptables -t nat -I POSTROUTING 3 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu