Ok, I got rid (moved to a safe place) of ~/.ssh/known_hosts. This happened:

norman@hubble ~/.ssh $ ssh nor...@www.firebirdsql.org
The authenticity of host 'www.firebirdsql.org (62.141.46.210)' can't be 
established.
RSA key fingerprint is 88:5e:b0:80:96:c0:e2:89:f8:52:a4:d8:a1:bc:9b:5f.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'www.firebirdsql.org,62.141.46.210' (RSA) to 
the list of known hosts.
Permission denied (publickey).

norman@hubble ~/.ssh $ ssh nor...@www.firebirdsql.org
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@       WARNING: POSSIBLE DNS SPOOFING DETECTED!          @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
The RSA host key for www.firebirdsql.org has changed,
and the key for the corresponding IP address 78.47.172.252
is unknown. This could either mean that
DNS SPOOFING is happening or the IP address for the host
and its host key have changed at the same time.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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
91:3e:7e:28:ff:be:a5:c1:1d:f2:e1:bf:7c:ff:10:e6.
Please contact your system administrator.
Add correct host key in /home/norman/.ssh/known_hosts to get rid of this 
message.
Offending RSA key in /home/norman/.ssh/known_hosts:1
   remove with: ssh-keygen -f "/home/norman/.ssh/known_hosts" -R 
www.firebirdsql.org
RSA host key for www.firebirdsql.org has changed and you have requested 
strict checking.
Host key verification failed.


Something weird is going on if you ask me. Especially as I pinged 
www.firebirdsql.org about 5 mins ago and got this:

norman@hubble ~ $ ping www.firebirdsql.org
PING www.firebirdsql.org (78.47.172.252) 56(84) bytes of data.
64 bytes from static.252.172.47.78.clients.your-server.de

Then, just now, I tried again and say this:

norman@hubble ~ $ ping www.firebirdsql.org
PING www.firebirdsql.org (62.141.46.210) 56(84) bytes of data.
64 bytes from exaybachay.de (62.141.46.210): icmp_req=1 ttl=53 time=27.8 ms


No wonder ssh can't keep up, the IP seems to be changing every couple of 
seconds!

There can't be a load balancer here can there? Either way, I'd assume 
that the IP would remain constant!

This doesn't help!

norman@hubble ~ $ nslookup www.firebirdsql.org
Server:         127.0.0.1
Address:        127.0.0.1#53

Non-authoritative answer:
Name:   www.firebirdsql.org
Address: 78.47.172.252
Name:   www.firebirdsql.org
Address: 62.141.46.210



Cheers,
Norm.

-- 
Norman Dunbar
Dunbar IT Consultants Ltd

Registered address:
Thorpe House
61 Richardshaw Lane
Pudsey
West Yorkshire
United Kingdom
LS28 7EL

Company Number: 05132767

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