Hi, JB
I must admit that I haven't gone through the logs, since my Logwatch doesn't report anything at all related to the specific ip-adress (from work), whereas it is abundant in reports on other invalid access-attempts.
The peculiar thing falls in two parts:
First I can get as far as the router with no problem - but my server doesn't respond. The connection just dies.
Second, anyone else, including me if I login from anywhere else than at work, can gain access to web and webmail.
I remember fiddling with a Dungog-contribs download and install (through putty) when the server stopped responding.
Coming home I restarted the server, and since then I'm blacklisted (but again, only from my workstation at work).