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when i try to connect to my remote server with the filezilla client i get the could not connect to server error. All the firewalls are set up properly and i dont know what else could be the problem. Im using canonical ubuntu 20.04 with putty and have installed ssh on there. if i got to ftptest.net i get this error:
Warning: Selected port (22) is not the default port (21) of the selected protocol.

Status: Resolving address of <my ip>

Status: Connecting to <my ip>

Warning: The entered address does not resolve to an IPv6 address.

Status: Connected, waiting for welcome message...

Reply: SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.5

Error: Reply does not contain valid response code

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Error: Reply does not contain valid response code

The replies sent by your server are violating the FTP specifications.
You have to upgrade to a proper server.

The ftptest.net site is primarily meant for FileZilla FTP Server. It cannot test SFTP servers, which is what you're attempting to do.

boco wrote: ↑

2022-05-15 12:20

The ftptest.net site is primarily meant for FileZilla FTP Server. It cannot test SFTP servers, which is what you're attempting to do.

Thanks a lot i didnt know that. The issue still persists on filezilla however, are there any more ways i can find out what is causing the could not connect to server error?

When you set up the firewalls, did you do it only for the main executable process? SFTP is handled by fzsftp, a different executable.