Error drag and drop files

Running Ubuntu Server 24.4
I usually develop stuff on my desktop (Mint 21.3) and then drag and drop files from my desktop to my server. This has worked fine for many years. Now when I try that I often get an error -

Error while copying “filename”
Invalid reply received

or sometimes permission denied. If I continue to try it works about once in 5 or 6 tries.
My user name is the same on both machines.
I recently updated my server from 22.4 to 24.2, but I can’t be certain that this is when the problem started.
Any suggestions?

Since you made clear you are not printing your files on one computer and scan them on the other to get them transferred, it would be nice if you told us all a little more about the technology underneath that drag and drop process :wink:

I.e. what type of connection protocol do you use between the two machines?

I open two file explorer windows (Nemo) on my desktop, one for local files and one via ‘connect to server’ for the remote server using SSH.I then drag and drop between those two windows.

Aha, ssh then, the ssh server was switched from a permanently running service to being socket activated, that might have some impact here…

You could try switching it back to be a service, there are instructions in the announcement IIRC