|A bit more information is required: |
is only a certain user affected or all all users ?
what is the TCPIP software on the system ? TCPIP services for VMS or Multinet (check with the commands UCX or TCPIP SHOW VERSION,
I assume UCX or TCPIP, the software I have running:
If the restriction is for all users, then it could be through ACCEPT or REJECT settings in TCPIP SERVICE TELNET.
Does the command TCPIP SHOW SERVICE TELNET/FULL list IP addresses unhder ACCEPT or REJECT headings ?
If yes, read TCPIP> HELP SET SERVICE /ACCEPT
how to change the list.
If the TELNET service is not restricted this way, there could be a reject after login through the system wide SYS$MANGER:SYLOGIN.COM
(or the commandfile defined by the logical name SYS$SYLOGIN) : look for code handling Telnet logins.
If the restriction is for an individual user, then the location could be in the users LOGIN command file, usually LOGIN.COM (or whatever the user athorization file entry for LGICMD defines).
Search in these command files for commands dealing with "TN" terminal devices, and "TT_Accpornam" used to get the login source IP address.