[webmin-l] Error - Access denied for <ip address>

[Joaquim H. <jo...@we...>]

On a host where I had not had reason to access Webmin in quite some 
time, I'm now getting a "Error - Access denied for <ip address>".

I have re-started webmin
I have checked miniserv.users
I have checked other logfiles (they only say the same thing 
"[05/Oct/2018:09:30:02 +0200] [123.123.123.123] Access denied for 
123.123.123.123"
/var/webmin/blocked is empty
Nothing in hosts.deny
I've tried with a different browser
I've upgraded Webmin from CLI from 1.860 to 1.890

I cannot seem to figure out WHY this IP is blocked. I've had this IP 
address for four years, and very rarely access Webmin from it.

SSH is set to key based authentication only.

The only slight hint of an issue I can see is in /var/log/auth.log where 
I get:

Oct  5 09:25:06 abcdhost perl: pam_unix(webmin:auth): authentication 
failure; logname= uid=0 euid=0 tty= ruser= rhost= user=root
Oct  5 09:25:08 abcdhost webmin[30042]: Webmin starting
Oct  5 09:25:41 abcdhost perl: pam_unix(webmin:auth): authentication 
failure; logname=root uid=0 euid=0 tty= ruser= rhost=  user=root
Oct  5 09:25:42 abcdhost webmin[30088]: Webmin starting


-joho