The specified registry key does not exist

Question

I recently reinstalled DPM 2012 R2 (fully updated) after deleting the protection groups, database, wiping the tapes, everything and reconfigured everything from scratch after it became too unstable to use.  Unfortunately since then I've found that the
MSDPMCurr.errlog is full events that look like the following:
163C      013C     
03/05     18:01:13.420      
09          
ApplicationSettings_expanded.cs(1387)                               
NORMAL            
Ignoring exception in ReadRegistryKey System.IO.IOException: The specified registry key does not exist.
163C      013C     
03/05     18:01:13.420      
09          
ApplicationSettings_expanded.cs(1387)                               
NORMAL            
   at Microsoft.Win32.RegistryKey.Win32Error(Int32 errorCode, String str)
163C      013C     
03/05     18:01:13.420      
09          
ApplicationSettings_expanded.cs(1387)                               
NORMAL            
   at Microsoft.Win32.RegistryKey.GetValueKind(String name)
163C      013C     
03/05     18:01:13.420      
09          
ApplicationSettings_expanded.cs(1387)                               
NORMAL            
   at Microsoft.Internal.EnterpriseStorage.Dls.Utils.ApplicationSettings.ReadRegistryKey(String registryKeyPath, String registryKeyName, Int32 registryValueKind)
Unfortunately it doesn't tell me what registry key it's looking for so I can't find out if it exists. Is there any way of finding this out?

Answer 1

Thanks for the advice, I found the vast majority of them were for cache entries and agree that these can be safely ignored.
HKLM\SOFTWARE\Microsoft\Microsoft Data Protection Manager\Configuration\CacheInquiryResults\<protected server FQDN>
However, I also found the following:
HKLM\Software\Microsoft\Microsoft Data Protection Manager\Setup\RebootRequired
HKLM\SOFTWARE\Microsoft\Microsoft Data Protection Manager\Configuration\gnorableSqlErrorNumbers
HKLM\SOFTWARE\Microsoft\Microsoft Data Protection Manager\Configuration\CloudBackupEnabledApps
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{8AB21D86-21F0-430A-9AD1-2D90077104C3}
HKLM\SOFTWARE\Microsoft\Microsoft Data Protection Manager\Configuration\UI
All of these are missing from the registry is this likely to cause any issues?
Edit: also found this repeated in a DPMRACurr.errlog:
0E08    16CC    03/09    08:30:03.323    05    genericstatus.cpp(1256)    [0000000003C32AA0]    ED0A1862-1405-438A-ABC8-22CFD64C278E    NORMAL  
 Wait for CallUpdateQfesInstalledRegKey succeeded. Returning m_QfesInstalled = 31
0E08    16CC    03/09    08:30:03.338    03    schannelutils.cpp(129)        ED0A1862-1405-438A-ABC8-22CFD64C278E    WARNING  
 Failed: Hr: = [0x80070002] : Error trying to open RegKey [HKLM\Software\Microsoft\Microsoft Data Protection Manager\Agent\2.0\Certificates\<FQDN of backup server>]