Hi Sunny,
leider habe ich noch Probleme mit der Migration der Clients. Ich habe den neuen WSUS nach eurer Anleitung nach https mit den Port 8531 gestellt. Auch alle GPO auf diesen neuen Internen Pfad ( 
(Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen).) geändert.
Nun bauen die Clients kein "Kontakt" zum Server auf...
Ich habe mal heute den Befehl "wuauclt.exe /detectnow ausgeführt und folgendes stand im log...
2016-01-22      08:18:48:831      1248      478      AU      AU setting next sqm report timeout to 2016-01-23 07:18:48
2016-01-22      08:18:50:628      1248      1774      AU      Triggering AU detection through DetectNow API
2016-01-22      08:18:50:628      1248      1774      AU      Triggering Online detection (non-interactive)
2016-01-22      08:18:50:628      1248      478      AU      #############
2016-01-22      08:18:50:628      1248      478      AU      ## START ##  AU: Search for updates
2016-01-22      08:18:50:628      1248      478      AU      #########
2016-01-22      08:18:50:629      1248      478      AU      <<## SUBMITTED ## AU: Search for updates [CallId = {E670B6A7-6555-446A-99BF-956C8A614E42}]
2016-01-22      08:18:50:629      1248      2ac      Agent      *************
2016-01-22      08:18:50:629      1248      2ac      Agent      ** START **  Agent: Finding updates [CallerId = AutomaticUpdates]
2016-01-22      08:18:50:629      1248      2ac      Agent      *********
2016-01-22      08:18:50:629      1248      2ac      Agent        * Online = Yes; Ignore download priority = No
2016-01-22      08:18:50:629      1248      2ac      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"
2016-01-22      08:18:50:629      1248      2ac      Agent        * ServiceID = {3DA21691-E39D-4DA6-8A4B-B43877BCB1B7} Managed
2016-01-22      08:18:50:629      1248      2ac      Agent        * Search Scope = {Machine}
2016-01-22      08:18:50:645      1248      2ac      Setup      Checking for agent SelfUpdate
2016-01-22      08:18:50:646      1248      2ac      Setup      Client version: Core: 7.6.7601.19077  Aux: 7.6.7601.19077
2016-01-22      08:18:50:662      1248      2ac      Misc      WARNING: Send failed with hr = 80072f8f.
2016-01-22      08:18:50:662      1248      2ac      Misc      WARNING: SendRequest failed with hr = 80072f8f. Proxy List used: <(null)> Bypass List used : <(null)> Auth Schemes used : <>
2016-01-22      08:18:50:662      1248      2ac      Misc      WARNING: WinHttp: SendRequestUsingProxy failed for < 
(Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen).. error 0x80072f8f
2016-01-22      08:18:50:662      1248      2ac      Misc      WARNING: WinHttp: SendRequestToServerForFileInformation MakeRequest failed. error 0x80072f8f
2016-01-22      08:18:50:662      1248      2ac      Misc      WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80072f8f
2016-01-22      08:18:50:662      1248      2ac      Misc      WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80072f8f
2016-01-22      08:18:50:662      1248      2ac      Misc      WARNING: Library download error. Error 0x80072f8f. Will retry. Retry Counter:0
2016-01-22      08:18:50:674      1248      2ac      Misc      WARNING: Send failed with hr = 80072f8f.
2016-01-22      08:18:50:674      1248      2ac      Misc      WARNING: SendRequest failed with hr = 80072f8f. Proxy List used: <(null)> Bypass List used : <(null)> Auth Schemes used : <>
2016-01-22      08:18:50:674      1248      2ac      Misc      WARNING: WinHttp: SendRequestUsingProxy failed for < 
(Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen).. error 0x80072f8f
2016-01-22      08:18:50:674      1248      2ac      Misc      WARNING: WinHttp: SendRequestToServerForFileInformation MakeRequest failed. error 0x80072f8f
2016-01-22      08:18:50:674      1248      2ac      Misc      WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80072f8f
2016-01-22      08:18:50:674      1248      2ac      Misc      WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80072f8f
2016-01-22      08:18:50:674      1248      2ac      Misc      WARNING: Library download error. Error 0x80072f8f. Will retry. Retry Counter:1
2016-01-22      08:18:50:686      1248      2ac      Misc      WARNING: Send failed with hr = 80072f8f.
2016-01-22      08:18:50:686      1248      2ac      Misc      WARNING: SendRequest failed with hr = 80072f8f. Proxy List used: <(null)> Bypass List used : <(null)> Auth Schemes used : <>
2016-01-22      08:18:50:686      1248      2ac      Misc      WARNING: WinHttp: SendRequestUsingProxy failed for  
(Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen).. error 0x80072f8f
2016-01-22      08:18:50:686      1248      2ac      Misc      WARNING: WinHttp: SendRequestToServerForFileInformation MakeRequest failed. error 0x80072f8f
2016-01-22      08:18:50:686      1248      2ac      Misc      WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80072f8f
2016-01-22      08:18:50:686      1248      2ac      Misc      WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80072f8f
2016-01-22      08:18:50:686      1248      2ac      Misc      WARNING: Library download error. Error 0x80072f8f. Will retry. Retry Counter:2
2016-01-22      08:18:50:698      1248      2ac      Misc      WARNING: Send failed with hr = 80072f8f.
2016-01-22      08:18:50:698      1248      2ac      Misc      WARNING: SendRequest failed with hr = 80072f8f. Proxy List used: <(null)> Bypass List used : <(null)> Auth Schemes used : <>
2016-01-22      08:18:50:698      1248      2ac      Misc      WARNING: WinHttp: SendRequestUsingProxy failed for  
(Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen).. error 0x80072f8f
2016-01-22      08:18:50:698      1248      2ac      Misc      WARNING: WinHttp: SendRequestToServerForFileInformation MakeRequest failed. error 0x80072f8f
2016-01-22      08:18:50:698      1248      2ac      Misc      WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80072f8f
2016-01-22      08:18:50:698      1248      2ac      Misc      WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80072f8f
2016-01-22      08:18:50:698      1248      2ac      Misc      WARNING: DownloadFileInternal failed for  
(Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen). error 0x80072f8f
2016-01-22      08:18:50:698      1248      2ac      Setup      FATAL: DownloadCab failed, err = 0x80072F8F
2016-01-22      08:18:50:698      1248      2ac      Setup      WARNING: SelfUpdate check failed to download package information, error = 0x80072F8F
2016-01-22      08:18:50:698      1248      2ac      Setup      FATAL: SelfUpdate check failed, err = 0x80072F8F
2016-01-22      08:18:50:698      1248      2ac      Misc      Registering binary: C:\windows\system32\regsvr32.exe  /s "C:\windows\system32\wintrust.dll"
2016-01-22      08:18:50:765      1248      2ac      Setup      Checking for agent SelfUpdate
2016-01-22      08:18:50:765      1248      2ac      Setup      Client version: Core: 7.6.7601.19077  Aux: 7.6.7601.19077
2016-01-22      08:18:50:777      1248      2ac      Misc      WARNING: Send failed with hr = 80072f8f.
2016-01-22      08:18:50:778      1248      2ac      Misc      WARNING: SendRequest failed with hr = 80072f8f. Proxy List used: <(null)> Bypass List used : <(null)> Auth Schemes used : <>
2016-01-22      08:18:50:778      1248      2ac      Misc      WARNING: WinHttp: SendRequestUsingProxy failed for  
(Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen).. error 0x80072f8f
2016-01-22      08:18:50:778      1248      2ac      Misc      WARNING: WinHttp: SendRequestToServerForFileInformation MakeRequest failed. error 0x80072f8f
2016-01-22      08:18:50:778      1248      2ac      Misc      WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80072f8f
2016-01-22      08:18:50:778      1248      2ac      Misc      WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80072f8f
2016-01-22      08:18:50:778      1248      2ac      Misc      WARNING: Library download error. Error 0x80072f8f. Will retry. Retry Counter:0
2016-01-22      08:18:50:790      1248      2ac      Misc      WARNING: Send failed with hr = 80072f8f.
2016-01-22      08:18:50:790      1248      2ac      Misc      WARNING: SendRequest failed with hr = 80072f8f. Proxy List used: <(null)> Bypass List used : <(null)> Auth Schemes used : <>
2016-01-22      08:18:50:790      1248      2ac      Misc      WARNING: WinHttp: SendRequestUsingProxy failed for  
(Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen).. error 0x80072f8f
2016-01-22      08:18:50:790      1248      2ac      Misc      WARNING: WinHttp: SendRequestToServerForFileInformation MakeRequest failed. error 0x80072f8f
2016-01-22      08:18:50:790      1248      2ac      Misc      WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80072f8f
2016-01-22      08:18:50:790      1248      2ac      Misc      WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80072f8f
2016-01-22      08:18:50:790      1248      2ac      Misc      WARNING: Library download error. Error 0x80072f8f. Will retry. Retry Counter:1
2016-01-22      08:18:50:802      1248      2ac      Misc      WARNING: Send failed with hr = 80072f8f.
2016-01-22      08:18:50:802      1248      2ac      Misc      WARNING: SendRequest failed with hr = 80072f8f. Proxy List used: <(null)> Bypass List used : <(null)> Auth Schemes used : <>
2016-01-22      08:18:50:802      1248      2ac      Misc      WARNING: WinHttp: SendRequestUsingProxy failed for  
(Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen).. error 0x80072f8f
2016-01-22      08:18:50:802      1248      2ac      Misc      WARNING: WinHttp: SendRequestToServerForFileInformation MakeRequest failed. error 0x80072f8f
2016-01-22      08:18:50:802      1248      2ac      Misc      WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80072f8f
2016-01-22      08:18:50:802      1248      2ac      Misc      WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80072f8f
2016-01-22      08:18:50:802      1248      2ac      Misc      WARNING: Library download error. Error 0x80072f8f. Will retry. Retry Counter:2
2016-01-22      08:18:50:814      1248      2ac      Misc      WARNING: Send failed with hr = 80072f8f.
2016-01-22      08:18:50:814      1248      2ac      Misc      WARNING: SendRequest failed with hr = 80072f8f. Proxy List used: <(null)> Bypass List used : <(null)> Auth Schemes used : <>
2016-01-22      08:18:50:814      1248      2ac      Misc      WARNING: WinHttp: SendRequestUsingProxy failed for  
(Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen).. error 0x80072f8f
2016-01-22      08:18:50:814      1248      2ac      Misc      WARNING: WinHttp: SendRequestToServerForFileInformation MakeRequest failed. error 0x80072f8f
2016-01-22      08:18:50:814      1248      2ac      Misc      WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80072f8f
2016-01-22      08:18:50:814      1248      2ac      Misc      WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80072f8f
2016-01-22      08:18:50:814      1248      2ac      Misc      WARNING: DownloadFileInternal failed for  
(Du musst Dich Einloggen oder Registrieren um Multimediadateien oder Links zu sehen). error 0x80072f8f
2016-01-22      08:18:50:814      1248      2ac      Setup      FATAL: DownloadCab failed, err = 0x80072F8F
2016-01-22      08:18:50:814      1248      2ac      Setup      WARNING: SelfUpdate check failed to download package information, error = 0x80072F8F
2016-01-22      08:18:50:814      1248      2ac      Setup      FATAL: SelfUpdate check failed, err = 0x80072F8F
2016-01-22      08:18:50:814      1248      2ac      Agent        * WARNING: Skipping scan, self-update check returned 0x80072F8F
2016-01-22      08:18:50:816      1248      2ac      Agent        * WARNING: Exit code = 0x80072F8F
2016-01-22