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Thank you Craigb and Bob3160 for your comments. I have tried all the tricks that I found in this forum and anywhere else and the only one effective was to uncheck “Automatically detect settings”. This option was checked when Avast 8.x was in use but no longer ever since Avast 9.x was introduced. The latest release 2013 did not bring any change in that respect. I have reported my experiments in my previous comments here in this thread.
I do believe without a moment of hesitation that in some enviroments (eg. that of Bob3160’s) it is possible to use Avast 9.x with automated settings detection for a LAN connection. I also use a mobile line and Avast can stay with all the default options untouched. I hardly believe it has anything to do with the ISP, which happens to be one of the biggest on the local markets - serving both wired and wireless connections.
I am happy using my wired connection with “unautomated settings detection” in LAN settings as long as it works so and hope my observation helps other users in their testing for a solution of this hitch.