In order to improve the security of the DICE computing infrastructure we have decided to disable support for the SSH version 1 protocol. This is a very old protocol which is now considered to be obsolete. Due to a number of design flaws it is known to be insecure and is vulnerable to man-in-the-middle attacks.
We have examined our logs and noted that in the last 5 months this protocol has only been used very occasionally. We have identified a small number of users who may be affected by this change and have contacted them directly to offer advice and assistance with reconfiguring or upgrading their SSH clients.