I have selected ‘manual’ both for the virus-db- as well as for the program update. At the very moment Avast does actually not try to connect automatically anymore, but I am sure it did until yesterday (with the settings being the same). I don’t know what the reason is, but it may have something to do that I ran the Spybot program in the meanwhile and deleted a couple of Windows-Registry entries in the process. In this context, it may be interesting that the Avast entries in my firewall-log always appeared in company with the Windows system program ‘Distributed COM Services’ (which is a well known security risk) before I partially disabled the latter in my firewall
PE,2004/09/30,14:23:49 +1:00 GMT,Distributed COM Services,0.0.0.0:0,N/A
PE,2004/09/30,14:23:56 +1:00 GMT,Distributed COM Services,0.0.0.0:0,N/A
PE,2004/09/30,14:26:59 +1:00 GMT,avast! antivirus service,194.168.4.100:53,N/A
PE,2004/10/01,09:45:55 +1:00 GMT,Distributed COM Services,0.0.0.0:0,N/A
PE,2004/10/01,09:46:08 +1:00 GMT,Distributed COM Services,0.0.0.0:0,N/A
PE,2004/10/01,09:50:29 +1:00 GMT,avast! antivirus service,194.168.4.100:53,N/A
PE,2004/10/01,14:44:51 +1:00 GMT,Distributed COM Services,0.0.0.0:0,N/A
PE,2004/10/01,14:45:09 +1:00 GMT,Distributed COM Services,0.0.0.0:0,N/A
PE,2004/10/01,14:47:04 +1:00 GMT,avast! antivirus service,194.168.4.100:53,N/A
PE,2004/10/02,14:37:37 +1:00 GMT,Distributed COM Services,0.0.0.0:0,N/A
PE,2004/10/02,14:37:56 +1:00 GMT,Distributed COM Services,0.0.0.0:0,N/A
PE,2004/10/02,14:43:36 +1:00 GMT,avast! antivirus service,194.168.4.100:53,N/A
and also
PE,2004/10/02,20:24:44 +1:00 GMT,Registry Checker,0.0.0.0:0,N/A
PE,2004/10/02,20:24:47 +1:00 GMT,Registry Checker,0.0.0.0:0,N/A
PE,2004/10/02,20:27:10 +1:00 GMT,avast! antivirus service,194.168.4.100:53,N/A
As I said, at the moment Avast seems to behave as it should, but I’ll keep you posted if any further irregularities occur.