Just tried this experiment.
1. MB (FT works) [Don't wanted to screw things up]
2. MBP (FT no luck yet)
Both machines are backed up with CCC from SL 10.6.8 and stored in to WD 1TB HDD with 2 Partiitions and each of 500GB. I already upgraded both to Lion. I keep the backup of both that I've made last week in case.
Since my MBP's FT not working but everything else working fine, I made another backup of my lion to another WD 500GB HDD if everything goes wrong, I can have my system where I was.
After all the discussion, maybe a clean installation will help fix the problem.
Experiment 1: [OVERWRITE SL UPGRADE]
I formatted MBP and restored to SL 10.6.8 and tried FT which I have in it works perfectly. And I upgraded to lion now and MBP still face FT problem. Same server connection error.
Experiment 2: [CLEAN INSTALL]
I installed SL accompanied with my MBP and upgraded to 10.6.8 and upgraded to lion and still NO LUCK.
That means for my MBP either upgrade from existing system or clean installation method doesn't fix my problem. So I used my Lion backup and restored my MBP to where it was before this experiment.
Remember Macbook's FT on lion still works and but MBP doesn't. However to make things clear both MBP and MB are in the same network.
Surely I think there is a BUG in it.
C'mon guys. Don't wanted to do a clean installation just for FT. But I still face another problem with my screensaver. That is just another topic.
How is your screensaver behaving? Mine start abruptly in the middle of my work.