After entering the command to attach to an xpra session:
xpra attach ssh:SERVERNAME:100
we get this response:
connection lost: empty marker in read queue
Connection lost
What does it mean? We can see the xpra session running on the server.
After entering the command to attach to an xpra session:
xpra attach ssh:SERVERNAME:100
we get this response:
connection lost: empty marker in read queue
Connection lost
What does it mean? We can see the xpra session running on the server.
Sounds like your version is too old, but your question really lacks details.
What Operating System? Version? Have you tried connecting locally (not via SSH), or via TCP? What does your server log file say? What command did you use to start the server? etc..