This issue just popped up.

I verified that the username/pw for my paid subscription is valid. I can reach the svn.observium.org url from the server (tested with curl).

I do still however get this error:

root@observium:/opt/observium# svn update svn: PROPFIND of '/svn/observium/trunk': Could not read status line: Connection reset by peer (http://svn.observium.org)

wat?