Exchange 2013 / Networker Backup Failed

Hello,

we're on Exchange 2013 CU11, Windows 2012 R2, NMM Version 8.2.3 and MAPI 1.2.1 Version 6.5.8320.0. We're got a DAG with four CAS and four MBX Server and since some days the backup of the MBX Server failed. If i check the VSS Writer for Exchange (vssadmin list writers) it is with no error before the beginning of the backup, after that it has an error.

Here are the error code of the NSR Log (NMM):

1900    48572    15.09.2016 05:04:49    DEBUG    11596    0    nsrsnap_vss_save    NSR    critical PS: (CPSImportService::GetOperationStatus) ERR: Error calling operation Status, status=7015:'Import failed on serverXY Reason: [null]'

1901    63890    15.09.2016 05:04:49    DEBUG    11596    0    nsrsnap_vss_save    NSR    critical NMM .. Error encountered performing snapshot import: PS .. Error during execution of snapshot import: 'Import failed on serverXY Reason: [null]'

1902    64034    15.09.2016 05:04:49    DEBUG    11596    0    nsrsnap_vss_save    NSR    critical NMM .. Error during import of snapshot: PS .. Error during execution of snapshot import: 'Import failed on serverXY Reason: [null]'.

1903    63372    15.09.2016 05:04:49    DEBUG    11596    0    nsrsnap_vss_save    NSR    critical NMM .. Registration of snapshot set failed -- PS .. Error during execution of snapshot import: 'Import failed on serverXY Reason: [null]'

Any suggestions for that?

Thank You!

F. Albers

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