We’re trying to limit processes on the login nodes, so this is causing the issues you are seeing such as blocking logins. The Remote SSH extension spawns a lot of process threads on the login nodes and they seem to stay active even after logging out from the Remote SSH session. The SSH FS extension should be fine, but your other processes running on the login nodes may block the login for this extension.
@dongzeye We stopped your vscode-server processes on the login nodes. So you should be able to log in again. I recommend removing the Remote SSH extension (and ~/.vscode-server directory in your /home1 directory) and switching to SSH FS extension.