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Users connecting to AIX server face disconnection after a period of inactivity. I have tried checking the /etc/profile.The TMOUT value seems to be 0.However there is disconnection being faced. Can someone help me to identify other areas that I probably may be missing.
The action related to the TMOUT environment variable can vary from shell to shell. It is completely ignored by some shells, and behaves as you specified in some shells (e.g., bash and ksh). In some implementations of ksh (and maybe other shells), a default maximum value can be built into the shell that cannot be overridden by setting TMOUT to 0.
I have no idea whether or not shells on AIX have TMOUT limits built into them, nor, if there are, whether they vary from release to release. And you haven't told us what shell is being used.