Excellent description of that at
"Planning password level changes"
Telnet is specifically laid out as may be affected. Why?
Any client that uses password substitution will not work correctly at
QPWDLVL 2 if the client hasn't
been updated to use the new password (passphrase) substitution scheme. The
administrator should check
whether a client which hasn't been updated to the new password
substitution scheme is required.
The clients that use password substitution include:
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