Inetserv 3.0 Telnet help
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Command      Required flag
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fwdlist      O
useradd      O
userdel      O
userlist     O
status       O
logger       O
motd         -
version      -
help         -
exit         -

You must wait for it to rehash the user file after you make changes. Make sure that your account has the T flag or it won't allow telnet access.