davincim,
Don't take anything I have said in this thread as a recommendation to switch to a different antivirus solution. I am also impressed by the volume of good press that avast gets and, after switching from Norton, I do intend to give avast a long and thorough try. Whatever my gripes may be about how avast interacts with Sygate, let us not forget that this is a secondary issue compared to the basic ones, i.e., the extent and quality of antivirus protection, the frequency and ease of updates, the range and scope of available scans, the demand on system resources, etc. So, just like yourself, I consider avast my antivirus product of choice. However, if we don't gripe, what are forums good for? Maybe for exchanging slaps OK but not on the back.
Now, regarding
So...Technical? Do you have any tricks in your magic bag that might make this problem go away?
I am all eyes. I love miracles too but, in case one is not forthcoming, I suggest that you consider the following:
1. Give up on the idea of handling the problem through an advanced rule, as I have done already myself. After all, if you are using the free version of Sygate, the number of advanced rules you can write is limited (see a comparison of Sygate free and paid for versions). So save the rule for a case that can be handled neatly without having to open your pc to the world.
2. Operate your pc in 'ask' mode and click 'yes' (but not 'remember my choice.....') any time avast wants to connect somewhere or be contacted by an avast server. You will have to click 'yes' twice early on and in quick succession each time you connect to the internet and every 4 hrs thereafter, if you stay connected that long.
3. If the above shoe doesn't fit, try turning off the automatic update feature altogether and do a manual update each time you connect to the internet. It only takes a few clicks and the longest time to complete I have seen so far is 7s.
4. Continue hoping for magic.