@shberge thanks again for all your efforts. I made a list with all causes that could lead to fault and the guilty was the ZTE router ... it has given a different IP to ER-605 and port forwarding...

@shberge when I am sending ping from PC of branch to HQ IP address has no answer. Is this normal ? I have no other idea to test the connection, it seems lost.

@shberge ΟC-200 is 192.168.0.190 [reserved by DHCP and permanently there]. this is the configuration in our HQ Thanks a lot for your efforts

@shberge

@shberge Thanks a lot for your efforts. But following the above orders was a complete disaster. All devices in branch office have been disappeared. Even after restoring old firmware 5.0.5 on EAP225....

@shberge Ports 29810-29814 were open fron the beginning, I have been aware of that. I am using TP-LINK OMADA ER-605 routers on both sites (headquarters and branch), each of them behind a ZTE-branded...