When logging in to europa.uio.no (the machine behind login.math.uio.no) you will likely receive the following error:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that a host key has just been changed. The fingerprint for the RSA key sent by the remote host is SHA256:I7kHx585Dv62VggFe/g4f/HrZh5MDMdxh5RBLHU7Q0k. Please contact your system administrator. Add correct host key in /Users/terjekv/.ssh/known_hosts to get rid of this message. Offending RSA key in /Users/terjekv/.ssh/known_hosts:24 RSA host key for login.math.uio.no has changed and you have requested strict checking. Host key verification failed.
This is expected. To resolve this, copy and paste the following into a terminal window:
ssh-keygen -R europa.uio.no;
ssh-keygen -R login.math.uio.no;
ssh-keygen -R 129.240.75.234;