Electron-Win10 Hanging at 3 dots loading



we have one Rocketchat Server. The Server is in our HQ and we have 4 other offices. In our HQ everything works fine. But in all other offices the clients randomly stack at the 3 dots loading screen. When Press Strg+R to reload ist works. Somtimes we must press reload 4-5 times bevor it works.Everytime i want to reproduce this behavior it works. So i think it’s maybe a timeout Problem but i cant’t find somthing in this Forum for this Topic.

Our Clients:
Windows10 1903-20h2
Rocketchat Client: 2.7.11 - 3.0.6
We have some Ubuntu Clients too with the some Problem.

Office-Client ->Firewall ->Internet -> Firewall -> Apache proxy ->HQ Rocketchat-Server

I hope this description is enough and sorry for the bad english.

Server Setup Information

  • Version of Rocket.Chat Server: 3.8.3
  • Operating System: Ubuntu 18.04.5 LTS x64
  • Deployment Method: snap
  • Number of Running Instances: 1
  • DB Replicaset Oplog:
  • NodeJS Version: v12.18.4
  • MongoDB Version: 3.6.14
  • Proxy: apache
  • Firewalls involved:2

Any additional Information