Unified Communications Diagnostics Server Health Tests with Event Log Monitoring enabled fail with the following error:
<Status ServerAddress="127.0.0.1" ErrorMessage="Error code = 0
 Error message = Incorrect function.
 Error source = msxml6.dll
 Error description = Not enough storage is available to complete this operation.

" ManagedObjectId="7" StartDateTime="40400.6465393519"/>
This error can be caused by large numbers of events logged on the target server. These servers can be Exchange/OCS/Blackberry servers. This is most likely due to informational logging level being enabled.
There are two possible workarounds for the problem. One is applicable in the situation when event log contains repeating events (one or more events are logged much more often than others), the second is applicable when the event log is huge without any specific event occurring more often.
There are some steps users should take in order to determine what workaround to use:
Workaround 1 (excluding noisy events):
1. In Server Health Test configuration scroll to event log section, delete Application\MSExchangeIS* (*) (for exchange 2007) or Application\MSExchange* (*) (for Exchange 2010) entry.
2. Create new entry that monitors the same sources but excluding noisy events. For example to exclude ids 1034, 2565 and 3334: Application\MSExchangeIS* (1-1033,1035-2564,2566-3333,3335-999999).
3. Save test configuration.
Workaround 2 (restricting size of the event description):
1. Stop Diagnostic services
2. Copy files from the attached zip to \Program Files\Quest\Spotlight on Messaging\ManagementConsole\Binaries directory
3. Create registry value:
[HKEY_LOCAL_MACHINE\SOFTWARE\Quest Software\Spotlight Management Framework\Diagnostic Services\TestProviders\ExchangeServerHealth] "MaxEventLogDescriptionLength"=DWORD:100.
Note: on 64 bit machine use
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Quest\Spotlight Management Framework\Diagnostic Services\TestProviders\ExchangeServerHealth]
4. Start services, wait a couple of monitoring intervals, if problem persists, decrease the value in registry from 100 to 50 or 20.
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