[Sat Dec 02 03:36:28.387347 2017] [:error] [pid 14396] [client 999.999.999.999:48999] EGroupware\\Api\\Mail\\Account::get_default1546 Error no Default available.No session password available!

01/12/2017 22:20:49 [13385] [DEBUG] [XXXXXXXXXXXX] HandleSync(): Start Output
01/12/2017 22:20:49 [13385] [DEBUG] [XXXXXXXXXXXX] ZPush::GetAdditionalSyncFolderStore('101000000000'): 'false'
01/12/2017 22:20:49 [13385] [DEBUG] [XXXXXXXXXXXX] SqlStateMachine(): init
01/12/2017 22:20:49 [13385] [DEBUG] [XXXXXXXXXXXX] SqlStateMachine->GetState(): devid:'xxxxxxxxxxxx' type:'folder_hashes' key:'folder_hashes' counter:'null'
01/12/2017 22:20:49 [13385] [ERROR] [XXXXXXXXXXXX] AlterPingChanges() Error happend in mail No session password available! blocking for 1920 seconds for Instance=example.com, User=XXXXXXXXXXXX, Device:xxxxxxxxxxxx
01/12/2017 22:20:49 [13385] [ERROR] [XXXXXXXXXXXX] HTTPReturnCodeException: Service Unavailable - code: 503 - file: /usr/share/egroupware/activesync/inc/class.activesync_backend.inc.php:1482
01/12/2017 22:20:49 [13385] [FATAL] [XXXXXXXXXXXX] WBXML debug data: AwFqAEVcT0sDezgwZTgyYjQyLTU1MzYtNDEwZi1iZDVhLTkyYjJhMjA5YmFlZX0xMgABUgMxMDEwMDAwMDAwMDAAAV4DMQABE1UDNTAAAVdYAzUAAQARRUYDMgABRwM1MTIwMAABAUVGAzQAAQEBAQEB
01/12/2017 22:20:49 [13385] [ INFO] [XXXXXXXXXXXX] User-agent: 'Android-SAMSUNG-SM-G930A/101.700-4.1.83.3'
01/12/2017 22:20:49 [13385] [FATAL] [XXXXXXXXXXXX] Exception: (HTTPReturnCodeException) - Service Unavailable
01/12/2017 22:20:49 [13385] [DEBUG] [XXXXXXXXXXXX] LoopDetection->ProcessLoopDetectionTerminate()
01/12/2017 22:20:49 [13385] [ INFO] [XXXXXXXXXXXX] cmd='Sync' memory='3.26 MiB/2.00 MiB' time='0.03s' devType='SAMSUNGSMGA' devId='xxxxxxxxxxxx' getUser='XXXXXXXXXXXX' from='999.999.999.999' version='EGroupware-17.1.20171130' method='POST' httpcode='503'
01/12/2017 22:20:49 [13385] [DEBUG] [XXXXXXXXXXXX] -------- End
01/12/2017 22:21:06 [14074] [DEBUG] [XXXXXXXXXXXX] activesync_backend::ChangesSink(30) returning Array()
01/12/2017 22:21:06 [14074] [DEBUG] [XXXXXXXXXXXX] activesync_backend::ChangesSink(30)
01/12/2017 22:21:06 [14074] [ERROR] [XXXXXXXXXXXX] AlterPingChanges() still blocking for an other 1903 seconds for Instance=example.com, User=XXXXXXXXXXXX, Device:xxxxxxxxxxxx
01/12/2017 22:21:06 [14074] [ERROR] [XXXXXXXXXXXX] HTTPReturnCodeException: Service Unavailable - code: 503 - file: /usr/share/egroupware/activesync/inc/class.activesync_backend.inc.php:1448
01/12/2017 22:21:06 [14074] [FATAL] [XXXXXXXXXXXX] WBXML debug data: 
01/12/2017 22:21:06 [14074] [ INFO] [XXXXXXXXXXXX] User-agent: 'Android-SAMSUNG-SM-G930A/101.700-4.1.83.3'
01/12/2017 22:21:06 [14074] [FATAL] [XXXXXXXXXXXX] Exception: (HTTPReturnCodeException) - Service Unavailable
01/12/2017 22:21:06 [14074] [DEBUG] [XXXXXXXXXXXX] LoopDetection->ProcessLoopDetectionTerminate()
01/12/2017 22:21:06 [14074] [ INFO] [XXXXXXXXXXXX] cmd='Ping' memory='7.85 MiB/10.00 MiB' time='150.49s' devType='SAMSUNGSMGA' devId='sec11