On 2026-07-05, Chris Green wrote: > None of my systems have a known_hosts file, I have it disabled as > follows:- > > HashKnownHosts no > StrictHostKeyChecking no > UserKnownHostsFile=/dev/null > LogLevel=ERROR > > Like quite a few people nowadays I find it more of a nusiance than a > help.
But it protects you from man-in-the-middle attacks which is a bigger nuisance. And which could cause your problem. > I can log in to other systems using the hostname rather than the IP > address. E.g. I have another VPS at gvps.uk and I can log in to that > using 'ssh gvps.uk'. I can't see any real difference between the > setup of gvps.uk and isbd.biz in my ~/.ssh/config file but one works > OK using the hostname and the other doesn't. If you have problem using hostname it could be a DNS problem. gvps.uk has no IPv6 but isbd.biz has one. $ dig +short isbd.biz aaaa 2a00:1098:82::6:1 Is 2a00:1098:82::6:1 the correct IPv6 adress ? If so could you try ssh 2a00:1098:82::6:1 ?
