There was a problem with MP Application Server, since reboot resolved the issue. However, without the logs we can't say what exact module failed and why. I would advise you to open a support ticket with Cisco TAC to collect the logs and investigate the failure. Your version is rather old and vulnerable to many already resolved defects, so you might be hitting an already known issue.
You will need to open a ticket with Cisco TAC Collaboration and Conferencing team: https://tools.cisco.com/ServiceRequestTool/scm/mgmt/case?referring_site=support_mm . You will need to have a valid support contract in order to do this.
Once you open a ticket, you would need to collect System Information Capture logs from your MP Application Server (Administration Center > Services > Logs > System Information Capture and specify the date and time of the issue) for at least an hour before the failure occurred up until 10-15min after the reboot.
That will be a good starting point to find out the root cause.
Furthermore, you might want to consider upgrading to 8.5 MR3 (which is a prerequisite for 8.6) and then to 8.6 which is the latest version of the software.
The short answer is that you don't.... That isn't entirely true while at
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the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
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Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...
This document describe how DST changes and how time changes are
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