This article is from the Amiga Networking FAQ, by Richard Norman with numerous contributions by others.
The first two questions were triggered by 3.0b2 which should no longer be used. Version 4.0 demo of AmiTCP has been officially released to Aminet . Although it is a "demo", it is fully functional. There will be a commercial version of AmiTCP available with new features.
NOTE: Do not install v4.0 over a non-working version of 3.0b2. Delete all the 3.0b2 files off the system (i.e. wipe the slate clean).
 
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