ISSUE
Client update scan failed with 0x800b0101
LOGS
ScanAgent.log
ScanJob({CEE453E8-8BCC-49ED-9915-694B67992145}): CScanJob::OnScanComplete -Scan Failed with Error=0x800b0101
ScanJob({CEE453E8-8BCC-49ED-9915-694B67992145}): CScanJobManager::OnScanComplete- failed at CScanJob::OnScanComplete with error=0x800b0101
WUHandler.log
Existing WUA Managed server was already set (https://contoso.lab.com:8531), skipping Group Policy registration. OnSearchComplete - Failed to end search job. Error = 0x800b0101. Scan failed with error = 0x800b0101.
ReportingEvents.log
{EF179D72-6F19-4869-853E-73A63525DEF8} 2022-05-03 08:40:37:284+1000 1 148 [AGENT_DETECTION_FAILED] 101 {3DA21691-E39D-4DA6-8A4B-B43877BCB1B7} 0 800b0101 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x800b0101. 8NVHr94N7E+gEzfX.61.0.0.3.0
{3D5BE85B-FC2D-4D39-B0BF-507A0E20FAB0} 2022-05-03 08:40:56:380+1000 1 148 [AGENT_DETECTION_FAILED] 101 {3DA21691-E39D-4DA6-8A4B-B43877BCB1B7} 0 800b0101 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x800b0101. 8NVHr94N7E+gEzfX.62.0.0.3.0
{6D3478DE-6A8A-4EC8-94E8-93BB09888462} 2022-05-03 08:40:56:845+1000 1 148 [AGENT_DETECTION_FAILED] 101 {3DA21691-E39D-4DA6-8A4B-B43877BCB1B7} 0 800b0101 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x800b0101. 8NVHr94N7E+gEzfX.63.0.0.3.0
{39457111-9DFE-419A-8DBC-8699452D81B9} 2022-05-03 08:40:57:330+1000 1 148 [AGENT_DETECTION_FAILED] 101 {3DA21691-E39D-4DA6-8A4B-B43877BCB1B7} 0 800b0101 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x800b0101. 8NVHr94N7E+gEzfX.64.0.0.3.0
{E35CC099-ED8C-4D7E-A0D8-8A8CF01E52C6} 2022-05-03 08:40:57:778+1000 1 148 [AGENT_DETECTION_FAILED] 101 {3DA21691-E39D-4DA6-8A4B-B43877BCB1B7} 0 800b0101 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x800b0101. 8NVHr94N7E+gEzfX.65.0.0.3.0
{A0B14D05-9A92-4013-859E-7F89FC47DEAC} 2022-05-03 08:40:58:233+1000 1 148 [AGENT_DETECTION_FAILED] 101 {3DA21691-E39D-4DA6-8A4B-B43877BCB1B7} 0 800b0101 CcmExec Failure Software Synchronization Windows Update Client failed to detect with error 0x800b0101. 8NVHr94N7E+gEzfX.66.0.0.3.0
0x800b0101 means:
Error Code: 0x800B0101 (2148204801)
Error Name: CERT_E_EXPIRED
Error Source: Windows
Error Message: A required certificate is not within its validity period when verifying against the current system clock or the timestamp in the signed file.
The client computer has a valid PKI client authentication. Since WSUS is configured with SSL, we checked its SSL certificate and found it invalid due to date expiration.
SOLUTION
Issued a new WSUS SSL certificate and imported it into IIS site
Refer to this article on how to configure WSUS SSL.
SCCM Monde 