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Can remote desktop session change a server's time upon login?

Posted on 2010-09-01
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Last Modified: 2012-08-14
I am troubleshooting a unusual time problem on the server clock.

The server is running Windows 2008 on VMWare ESXi 3.5. occassionally the server time would change by falling back two hours. On the VMWare tools, I have disable the time sync between the hardware and the OS (for some reason enabling the sync does not solve the issue but instead causes the hardware clock to be wrong too).

The server is already pointed to a NTP server but still the problem persist.

I have also added scripts to force a time sync with the ntp server every morning.

I am suspecting it is because a authorized roaming consultant is logging in using Remote Desktop and that may have caused the server clock to change.

I ahev an Active Directory, DNS and SNTP servers in my LAN. Any suggestions?
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Question by:sidartra
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Radhakrishnan R earned 250 total points
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by:Lee W, MVP
Lee W, MVP earned 250 total points
ID: 33583846
If you're users dont' have admin rights, then they shouldn't be able to affect anything other than their time zone setting.  This is somewhat dated, but According to "KM" in this link below:
This must be the policy set (not-set) on your Terminal service client device that allows to redirect the Time Zone settings.
Try adding this reg.key [HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services],"fEnableTimeZoneRedirection"
I don't know if it works on XP/XPe though. (if doesn't work with RDP 5.1, download RDP 5.2 QFE and try with it too)

This policy Specifies whether to allow the client computer to redirect its time zone settings to the Terminal Services session. By
default, the session time zone is the same as the server time zone, and the client computer cannot redirect its time zone
information. If the status is set to Enabled, clients that are capable of time zone redirection send their time zone information to
the server. The server base time is then used to calculate the current session time (current session time = server base time +
client time zone). Currently, Remote Desktop Connection and Windows CE 5.1 are the only clients capable of time zone redirection.
Session 0 (the console session) always has the server time zone and settings. To change the system time and time zone, connect to
session 0. If the status is set to Disabled, time zone redirection is not possible. If the status is set to Not Configured, time
zone redirection is not specified at the Group Policy level and the default behavior is for time zone redirection to be turned off.
When an administrator changes this setting, only new connections display the behavior specified by the new setting. Sessions that
were initiated before the change must log off and reconnect to be affected by the new setting. Microsoft recommends that all users
log off the server after this setting is changed. Note: Time zone redirection is only possible when connecting to a Windows Server
2003 family terminal server.

http://www.pcreview.co.uk/forums/thread-530800.php (a little less than half way down the thread).
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by:sidartra
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