Keine Idee, schau doch mal in die %windir%\windowsupdate.log. Falls das OS W10 ist, musst Du die Datei zuerst mit Hilfe der Powershell erzeugen lassen.

Letzter Abruf schaute so aus:

2019.12.02 15:33:28.8510523 6720  6684  ComApi          IUpdateServiceManager::AddService2
2019.12.02 15:33:28.8510547 6720  6684  ComApi          Service ID = {7971f918-a847-4430-9279-4a52d1efe18d}
2019.12.02 15:33:28.8510577 6720  6684  ComApi          Allow pending registration = Yes; Allow online registration = Yes; Register service with AU = Yes
2019.12.02 15:33:28.8569949 6720  6684  ComApi          Added service, URL = (Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen).
2019.12.02 15:33:28.8615735 6720  6684  ComApi          * START *   Federated Search ClientId = UpdateOrchestrator (cV: dAgZdtBTiESNbpa8.1.1.0)
2019.12.02 15:33:28.8632251 12640 23752 IdleTimer       WU operation (SR.UpdateOrchestrator ID 811) started; operation # 4150; does use network; is not at background priority
2019.12.02 15:33:28.8645013 12640 11672 IdleTimer       WU operation (SR.UpdateOrchestrator ID 811, operation # 4150) stopped; does use network; is not at background priority
2019.12.02 15:33:28.8689584 6720  1824  ComApi          Federated Search: Starting search against 1 service(s) (cV = dAgZdtBTiESNbpa8.1.1.0)
2019.12.02 15:33:28.8691311 6720  1824  ComApi          * START *   Search ClientId = UpdateOrchestrator, ServiceId = 3DA21691-E39D-4DA6-8A4B-B43877BCB1B7, Flags: 0X40010410 (cV = dAgZdtBTiESNbpa8.1.1.0.0)
2019.12.02 15:33:28.8713097 12640 23752 IdleTimer       WU operation (CSearchCall::Init ID 812) started; operation # 4153; does use network; is not at background priority
2019.12.02 15:33:28.8743494 12640 23752 Agent           * START * Queueing Finding updates [CallerId = UpdateOrchestrator  Id = 812]
2019.12.02 15:33:28.8743577 12640 23752 Agent           Removing service 3DA21691-E39D-4DA6-8A4B-B43877BCB1B7 from sequential scan list
2019.12.02 15:33:28.8743662 12640 23752 Agent           Service 3DA21691-E39D-4DA6-8A4B-B43877BCB1B7 is not in sequential scan list
2019.12.02 15:33:28.8743721 12640 23752 Agent           Added service 3DA21691-E39D-4DA6-8A4B-B43877BCB1B7 to sequential scan list
2019.12.02 15:33:28.8745789 12640 2404  Agent           Service 3DA21691-E39D-4DA6-8A4B-B43877BCB1B7 is in sequential scan list
2019.12.02 15:33:28.8763689 12640 8752  Agent           * END * Queueing Finding updates [CallerId = UpdateOrchestrator  Id = 812]
2019.12.02 15:33:28.8778934 12640 8752  Agent           * START * Finding updates CallerId = UpdateOrchestrator  Id = 812 (cV = dAgZdtBTiESNbpa8.1.1.0.0.2)
2019.12.02 15:33:28.8778977 12640 8752  Agent           Online = Yes; Interactive = Yes; AllowCachedResults = No; Ignore download priority = No
2019.12.02 15:33:28.8779037 12640 8752  Agent           Criteria = IsInstalled=0 and DeploymentAction='Installation' or IsInstalled=0 and DeploymentAction='OptionalInstallation' or IsPresent=1 and DeploymentAction='Uninstallation' or IsInstalled=1 and DeploymentAction='Installation' and RebootRequired=1 or IsInstalled=0 and DeploymentAction='Uninstallation' and RebootRequired=1""
2019.12.02 15:33:28.8779092 12640 8752  Agent           ServiceID = {3DA21691-E39D-4DA6-8A4B-B43877BCB1B7} Managed
2019.12.02 15:33:28.8779110 12640 8752  Agent           Search Scope = {Machine}
2019.12.02 15:33:28.8779190 12640 8752  Agent           Caller SID for Applicability: S-1-5-21-1221855275-274533208-697575874-29912
2019.12.02 15:33:28.8779208 12640 8752  Agent           ProcessDriverDeferrals is set
2019.12.02 15:33:28.9061870 12640 8752  Misc            Got WSUS Client/Server URL: (Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen)."
2019.12.02 15:33:28.9096868 12640 8752  Driver          Skipping printer driver 4 due to incomplete info or mismatched environment - HWID[(null)] Provider[(null)] MfgName[(null)] Name[Send To Microsoft OneNote 2010 Driver] pEnvironment[Windows x64] LocalPrintServerEnv[Windows x64]
2019.12.02 15:33:28.9096897 12640 8752  Driver          Skipping printer driver 5 due to incomplete info or mismatched environment - HWID[(null)] Provider[Microsoft] MfgName[Microsoft] Name[Remote Desktop Easy Print] pEnvironment[Windows x64] LocalPrintServerEnv[Windows x64]
2019.12.02 15:33:28.9096920 12640 8752  Driver          Skipping printer driver 6 due to incomplete info or mismatched environment - HWID[(null)] Provider[(null)] MfgName[(null)] Name[pdfFactory 4] pEnvironment[Windows x64] LocalPrintServerEnv[Windows x64]
2019.12.02 15:33:28.9096946 12640 8752  Driver          Skipping printer driver 13 due to incomplete info or mismatched environment - HWID[(null)] Provider[Adobe] MfgName[Adobe] Name[Adobe PDF Converter] pEnvironment[Windows x64] LocalPrintServerEnv[Windows x64]
2019.12.02 15:33:28.9096975 12640 8752  Driver          Skipping printer driver 14 due to incomplete info or mismatched environment - HWID[microsoftmicrosoft_musd] Provider[Microsoft] MfgName[Microsoft] Name[Microsoft enhanced Point and Print compatibility driver] pEnvironment[Windows NT x86] LocalPrintServerEnv[Windows x64]
2019.12.02 15:33:29.2801330 12640 8752  ProtocolTalker  ServiceId = {3DA21691-E39D-4DA6-8A4B-B43877BCB1B7}, Server URL = (Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen).
2019.12.02 15:33:29.2803095 12640 8752  ProtocolTalker  OK to reuse existing configuration
2019.12.02 15:33:29.2803133 12640 8752  ProtocolTalker  Existing cookie is valid, just use it
2019.12.02 15:33:29.2803147 12640 8752  ProtocolTalker  PTInfo: Server requested registration
2019.12.02 15:33:31.2328827 12640 8752  IdleTimer       WU operation (CAgentProtocolTalker::SyncUpdates_WithRecover) started; operation # 4154; does use network; is at background priority
2019.12.02 15:33:31.2329235 12640 8752  WebServices     Auto proxy settings for this web service call.
2019.12.02 15:33:31.8178522 12640 8752  WebServices     WS error: Der Text der empfangenen Nachricht enthielt einen Fehler.
2019.12.02 15:33:31.8178544 12640 8752  WebServices     WS error: Fault occurred
2019.12.02 15:33:31.8178561 12640 8752  WebServices     WS Error code: Client
2019.12.02 15:33:31.8178705 12640 8752  WebServices     WS error: <detail><ErrorCode>ConfigChanged</ErrorCode><Message></Message><ID>835d0977-03fa-42b9-9a6f-7d99e2018435</ID><Method> (Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen)."
2019.12.02 15:33:31.8178970 12640 8752  ProtocolTalker  PT: Calling GetConfig on server
2019.12.02 15:33:31.8179040 12640 8752  IdleTimer       WU operation (CAgentProtocolTalker::GetConfig_WithRecovery) started; operation # 4155; does use network; is at background priority
2019.12.02 15:33:31.8401089 12640 8752  IdleTimer       WU operation (CAgentProtocolTalker::GetConfig_WithRecovery, operation # 4155) stopped; does use network; is at background priority
2019.12.02 15:33:31.8409120 12640 8752  Misc            Got WSUS SimpleTargeting URL: (Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen)."
2019.12.02 15:33:31.8419681 12640 8752  IdleTimer       WU operation (CAuthorizationCookieWrapper::InitializeSimpleTargetingCookie) started; operation # 4156; does use network; is at background priority
2019.12.02 15:33:31.8419714 12640 8752  ProtocolTalker  Initializing simple targeting cookie, clientId = 1402ee06-0d28-4811-8449-d832d9d36b0c, target group = win10-client, DNS name = ws2001.sudhoff-technik.de
2019.12.02 15:33:31.8419726 12640 8752  ProtocolTalker    Server URL = (Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen).
2019.12.02 15:33:31.8419961 12640 8752  WebServices     Auto proxy settings for this web service call.
2019.12.02 15:33:31.8809646 12640 8752  IdleTimer       WU operation (CAuthorizationCookieWrapper::InitializeSimpleTargetingCookie, operation # 4156) stopped; does use network; is at background priority
2019.12.02 15:33:31.8811719 12640 8752  IdleTimer       WU operation (CAgentProtocolTalker::GetCookie_WithRecovery) started; operation # 4157; does use network; is at background priority
2019.12.02 15:33:31.8866932 12640 8752  IdleTimer       WU operation (CAgentProtocolTalker::GetCookie_WithRecovery, operation # 4157) stopped; does use network; is at background priority
2019.12.02 15:33:31.8867167 12640 8752  ProtocolTalker  PTInfo: Server requested registration
2019.12.02 15:33:31.9003376 12640 8752  ProtocolTalker  PTInfo: Calling RegisterComputer
2019.12.02 15:33:31.9003451 12640 8752  IdleTimer       WU operation (CAgentProtocolTalker::RegisterComputer_WithRecovery) started; operation # 4158; does use network; is at background priority
2019.12.02 15:33:31.9384860 12640 8752  IdleTimer       WU operation (CAgentProtocolTalker::RegisterComputer_WithRecovery, operation # 4158) stopped; does use network; is at background priority
2019.12.02 15:33:31.9593518 12640 8752  WebServices     WS error: Der Text der empfangenen Nachricht enthielt einen Fehler.
2019.12.02 15:33:31.9593582 12640 8752  WebServices     WS error: Der Text der empfangenen Nachricht enthielt einen Fehler.
2019.12.02 15:33:31.9593672 12640 8752  WebServices     WS error: Fault occurred
2019.12.02 15:33:31.9593731 12640 8752  WebServices     WS Error code: Client
2019.12.02 15:33:31.9594273 12640 8752  WebServices     WS error: <detail><ErrorCode>FileLocationChanged</ErrorCode><Message></Message><ID>438ddcd1-8872-4b19-bf70-11b2209ccb92</ID><Method> (Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen)."
2019.12.02 15:33:31.9595338 12640 8752  ProtocolTalker  PT: Calling GetConfig on server
2019.12.02 15:33:31.9595577 12640 8752  IdleTimer       WU operation (CAgentProtocolTalker::GetConfig_WithRecovery) started; operation # 4159; does use network; is at background priority
2019.12.02 15:33:31.9684712 12640 8752  IdleTimer       WU operation (CAgentProtocolTalker::GetConfig_WithRecovery, operation # 4159) stopped; does use network; is at background priority
2019.12.02 15:33:31.9685324 12640 8752  ProtocolTalker  Cached cookie has expired or new PID is available
2019.12.02 15:33:31.9685588 12640 8752  Misc            G