Windows Server 2016 - WSUS Fehlercode (0x80244019) Zerifikat und Port auf SSL 8531

Hallo an alle,

ich habe meine WSUS server von 2008 auf 2016 umgestellt.
Zum Server, der Server ladet die Files vom Internet ganz normal runter. er findet auch die Clients.

Wenn ich bei einem Client folgendes eingebe ladet er mir die Datei runter:

https://wsusname:8531/selfupdate/iuident.cab

Soweit ok.

Im LOG am Client schreibt er folgende Fehlermeldungen:

2017-02-22 10:02:38:256 1336 17ac Agent START Agent: Finding updates [CallerId = AutomaticUpdates]
2017-02-22 10:02:38:256 1336 17ac Agent *
2017-02-22 10:02:38:256 1336 17ac Agent * Online = Yes; Ignore download priority = No
2017-02-22 10:02:38:256 1336 17ac Agent * Criteria = "IsInstalled=0 and DeploymentAction='Installation' or IsPresent=1 and DeploymentAction='Uninstallation' or IsInstalled=1 and DeploymentAction='Installation' and RebootRequired=1 or IsInstalled=0 and DeploymentAction='Uninstallation' and RebootRequired=1"
2017-02-22 10:02:38:256 1336 17ac Agent * ServiceID = {3DA21691-E39D-4DA6-8A4B-B43877BCB1B7} Managed
2017-02-22 10:02:38:256 1336 17ac Agent * Search Scope = {Machine}
2017-02-22 10:02:38:256 1336 17ac Setup Checking for agent SelfUpdate
2017-02-22 10:02:38:257 1336 17ac Setup Client version: Core: 7.6.7601.23453 Aux: 7.6.7601.23453
2017-02-22 10:02:38:283 1336 17ac Misc Validating signature for C:\Windows\SoftwareDistribution\SelfUpdate\wuident.cab with dwProvFlags 0x00000080:
2017-02-22 10:02:38:296 1336 17ac Misc Microsoft signed: NA
2017-02-22 10:02:38:302 1336 17ac Misc Validating signature for C:\Windows\SoftwareDistribution\SelfUpdate\TMPD6DC.tmp with dwProvFlags 0x00000080:
2017-02-22 10:02:38:311 1336 17ac Misc Microsoft signed: NA
2017-02-22 10:02:38:317 1336 17ac Misc Validating signature for C:\Windows\SoftwareDistribution\SelfUpdate\wsus3setup.cab with dwProvFlags 0x00000080:
2017-02-22 10:02:38:323 1336 17ac Misc Microsoft signed: NA
2017-02-22 10:02:38:336 1336 17ac Misc Validating signature for C:\Windows\SoftwareDistribution\SelfUpdate\wsus3setup.cab with dwProvFlags 0x00000080:
2017-02-22 10:02:38:342 1336 17ac Misc Microsoft signed: NA
2017-02-22 10:02:38:363 1336 17ac Setup Determining whether a new setup handler needs to be downloaded
2017-02-22 10:02:38:363 1336 17ac Setup SelfUpdate handler is not found. It will be downloaded
2017-02-22 10:02:38:363 1336 17ac Setup Evaluating applicability of setup package "WUClient-SelfUpdate-ActiveX~31bf3856ad364e35~amd64~~7.6.7600.320"
2017-02-22 10:02:38:366 1336 17ac Setup Setup package "WUClient-SelfUpdate-ActiveX~31bf3856ad364e35~amd64~~7.6.7600.320" is already installed.
2017-02-22 10:02:38:367 1336 17ac Setup Evaluating applicability of setup package "WUClient-SelfUpdate-Aux-TopLevel~31bf3856ad364e35~amd64~~7.6.7600.320"
2017-02-22 10:02:38:392 1336 17ac Setup Setup package "WUClient-SelfUpdate-Aux-TopLevel~31bf3856ad364e35~amd64~~7.6.7600.320" is already installed.
2017-02-22 10:02:38:392 1336 17ac Setup Evaluating applicability of setup package "WUClient-SelfUpdate-Core-TopLevel~31bf3856ad364e35~amd64~~7.6.7600.320"
2017-02-22 10:02:38:431 1336 17ac Setup Setup package "WUClient-SelfUpdate-Core-TopLevel~31bf3856ad364e35~amd64~~7.6.7600.320" is already installed.
2017-02-22 10:02:38:431 1336 17ac Setup SelfUpdate check completed. SelfUpdate is NOT required.
2017-02-22 10:02:38:619 1336 17ac PT +++++++++++ PT: Synchronizing server updates +++++++++++
2017-02-22 10:02:38:619 1336 17ac PT + ServiceId = {3DA21691-E39D-4DA6-8A4B-B43877BCB1B7}, Server URL = https://WSUSSERVERNAME:8531/ClientWebService/client.asmx
2017-02-22 10:02:38:627 1336 17ac PT WARNING: Cached cookie has expired or new PID is available
2017-02-22 10:02:38:627 1336 17ac PT Initializing simple targeting cookie, clientId = e6478999-e4dc-4582-8da0-2ddae728ff86, target group = , DNS name = PC.name+domäne.at
2017-02-22 10:02:38:627 1336 17ac PT Server URL = https://WSUSSERVERNAME:8531/SimpleAuthWebService/SimpleAuth.asmx
2017-02-22 10:02:38:698 1336 17ac PT WARNING: GetCookie failure, error = 0x80244019, soap client error = 10, soap error code = 0, HTTP status code = 404
2017-02-22 10:02:38:699 1336 17ac PT WARNING: PTError: 0x80244019
2017-02-22 10:02:38:699 1336 17ac PT WARNING: GetCookie_WithRecovery failed : 0x80244019
2017-02-22 10:02:38:699 1336 17ac PT WARNING: RefreshCookie failed: 0x80244019
2017-02-22 10:02:38:699 1336 17ac PT WARNING: RefreshPTState failed: 0x80244019
2017-02-22 10:02:38:699 1336 17ac PT WARNING: Sync of Updates: 0x80244019
2017-02-22 10:02:38:699 1336 17ac PT WARNING: SyncServerUpdatesInternal failed: 0x80244019
2017-02-22 10:02:38:699 1336 17ac Agent * WARNING: Failed to synchronize, error = 0x80244019
2017-02-22 10:02:38:700 1336 17ac Agent * WARNING: Exit code = 0x80244019
2017-02-22 10:02:38:700 1336 17ac Agent *
2017-02-22 10:02:38:700 1336 17ac Agent END Agent: Finding updates [CallerId = AutomaticUpdates]
2017-02-22 10:02:38:700 1336 17ac Agent *
2017-02-22 10:02:38:700 1336 17ac Agent WARNING: WU client failed Searching for update with error 0x80244019
2017-02-22 10:02:38:707 1336 1308 AU >>## RESUMED ## AU: Search for updates [CallId = {0D020BE5-E004-4973-B561-F28EEFEB0300}]
2017-02-22 10:02:38:707 1336 1308 AU # WARNING: Search callback failed, result = 0x80244019
2017-02-22 10:02:38:707 1336 1308 AU # WARNING: Failed to find updates with error code 80244019
2017-02-22 10:02:38:707 1336 1308 AU #########
2017-02-22 10:02:38:707 1336 1308 AU ## END ## AU: Search for updates [CallId = {0D020BE5-E004-4973-B561-F28EEFEB0300}]
2017-02-22 10:02:38:707 1336 1308 AU #############
2017-02-22 10:02:38:708 1336 1308 AU Successfully wrote event for AU health state:0
2017-02-22 10:02:38:708 1336 1308 AU AU setting next detection timeout to 2017-02-22 14:02:38
2017-02-22 10:02:38:709 1336 1308 AU Setting AU scheduled install time to 2017-02-24 09:00:00
2017-02-22 10:02:38:709 1336 1308 AU Successfully wrote event for AU health state:0
2017-02-22 10:02:38:710 1336 1308 AU Successfully wrote event for AU health state:0
2017-02-22 10:02:42:506 1336 17ac Report REPORT EVENT: {848744BB-0D62-422D-BF58-AC7520C0AD13} 2017-02-22 10:02:38:700+0100 1 148 101 {00000000-0000-0000-0000-000000000000} 0 80244019 AutomaticUpdates Failure Software Synchronization Windows Update Client failed to detect with error 0x80244019.
2017-02-22 10:02:42:519 1336 17ac Report CWERReporter::HandleEvents - WER report upload completed with status 0x8
2017-02-22 10:02:42:519 1336 17ac Report WER Report sent: 7.6.7601.23453 0x80244019(0) 0000000-0000-0000-0000-000000000000 Scan 0 1 AutomaticUpdates {3DA21691-E39D-4DA6-8A4B-B43877BCB1B7} 0


Hat von euch jemand eine Idee woran das Downloaden der Clients liegen könnte. Ich tippe ja noch immer auf den IIS - wobei ich hier bei der Fehlersuche etwas ratlos bin.

Danke für eure Hilfe.