Does anyone know if it is possible to change/adjust VCS's operating system time manually?
We want to do that without NTP server and no TImezone setting.
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If you really have to you can log in with the root account to the VCS and use the Linux date command to set the correct date and time.
However I would strongly recommend configuring an NTP server in the VCS, even if it is one from pool.ntp.org as correct time is critical to H.323 authentication.
Without correct time you may end up seeing a lot of registration rejected messages for H.323 with a reason "Time difference too large for authentication"
Hi Guy, Alok
Thank you for your information!
I could change the time of VCS manually.
I know cisco strogly recommends to use NTP server.
I needed to do this just for an authentication test.
Not directly mentioned by Alok, but the date command has to be executed by the user root on the vcs.
When you set the time like that, the timezone will still be used, you would set the local time,
logfiles might show the relative time based on GMT.
So check that you have the timezone proper (or set it to GMT) and also do not forget to remove the NTP server.
H323 registrations will fail if the time offset is to big (think its 5 minutes).
Like you said, NTP shall be used, my recomandation is to use the same server(pool) for all components you operate,
so do not forget to set an ntp server again after testing :-)
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