Extensions that can possibly interferewith connections:
AOL Link
CompuservePPP
Cyberworks
Faxing extensions
Global Village Toolbox (sometimes; this allows themto send faxes)
Internet Access
Interslip
Omniwriter
Port Juggler
PPP (version 2.5, from the Apple Internet ConnectionKit)*
ProDOS File System
Ram Doubler (versions older than 1.62, or 2.0) **
Speed Doubler (versions older than 1.32, or 2.0)**
TCPack for AOL
TCPack for Eworld
Token Ring
* Make sure that if you use the Mindspring softwarethe version
of your Config PPP control panelis FreePPP 1.05 and the version
of your PPP Extension is FreePPP1.05
** Version 2.0 and higher of these are Control Panels,not extensions