FOSS gamedev and creative worlds

With latest stable client all I get when connecting to some servers (eg. kray's) is:

Access denied. Reason: Your client is too old. Please upgrade.

It would be great if the error message would also include the version running on the server so I know which beta, preview or branch I need here.

Kray isnt updated i guess :D

Ack.

Though this cannot be done exactly, as the server checks a network protocol version, not the program version. But the server could tell the version of itself, which could help considerably.