This probably isn’t necessarily an EndeavourOS issue, but probably a KDE issue, in which case I’m more than happy to forward this to the KDE team.
Whenever I have my virtualbox VMs up with SSH servers on them, I can connect to them through sftp:// on dolphin and see their files, but after some time (like a couple minutes) the servers become inaccessible. I can’t add new files, rename, open, etc. Any advice is appreciated!
I’m not personally convinced it’s a KDE or Dolphin issue, as I use SFTP extensively daily, both on my LAN and to access remote servers, and it hasn’t exhibited this issue.
Now I don’t want to leave it at that, because “it works for me” posts are infuriatingly unhelpful.
Some of this may depend on your SSH server configs within your VMs. Have a look at the Keep alive section in the Arch OpenSSH wiki.