Periodic ETIMEDOUT, 425 response and Error: Failed to retrieve directory listing

[rsford31]

Hi, I have a client that is using FileZilla to connect to our internal server over a VPN tunnel. He can connect but then will periodically get disconnected with a "failed to retrieve directory listing".

I can connect to the same server using the same FileZilla version as he is and have no issues.

Also there are two subfolders within the root. They are not displaying for him but are for me. If he manually enters the folder name in the Remote site field he can get into the folder with no issues.

He's connecting using FTPS on port 990.

This is what I'm seeing in the logs:
2018-09-21 13:58:53 18892 1 Response: 150 Opening BINARY mode data connection for LIST return info.
2018-09-21 13:59:14 18892 1 Error: The data connection could not be established: ETIMEDOUT - Connection attempt timed out
2018-09-21 13:59:25 18892 1 Response: 425 Received no data connection request.
2018-09-21 13:59:25 18892 1 Error: Failed to retrieve directory listing

I've attached the full version.

[rsford31]

I should add that when I connect I'm doing so using his credentials. If it were a permissions issue I would not see the folders either.

[Tim Kosse]

Are you also using a VPN tunnel?