Network connection: Windows Update Agent encountered transient network connection-related errors

Network connection: Windows
Update Agent encountered transient network connection-related errors

I also noticed that the the amout of errors is increasing when new updates are available or deadline reached.Then, the numbers of errors decreases from day to day.

On the client, I've found the following error :

Windowsupdate.log

2015-05-19 11:45:19:396  488 1470 Misc WARNING: Send failed with hr = 80072ee2.
2015-05-19 11:45:19:396  488 1470 Misc WARNING: SendRequest failed with hr = 80072ee2. Proxy List used: <(null)> Bypass List used : <(null)> Auth Schemes used : <>
2015-05-19 11:45:19:396  488 1470 Misc FATAL: SOAP/WinHttp - SendRequest: SendRequestUsingProxy failed. error 0x80072ee2
2015-05-19 11:45:19:396  488 1470 PT   + Last proxy send request failed with hr = 0x80072EE2, HTTP status code = 0
2015-05-19 11:45:19:396  488 1470 PT   + Caller provided credentials = No
2015-05-19 11:45:19:396  488 1470 PT   + Impersonate flags = 0
2015-05-19 11:45:19:396  488 1470 PT   + Possible authorization schemes used =
2015-05-19 11:45:19:396  488 1470 PT WARNING: GetCookie failure, error = 0x80072EE2, soap client error = 5, soap error code = 0, HTTP status code = 200
2015-05-19 11:45:19:396  488 1470 PT WARNING: PTError: 0x80072ee2
2015-05-19 11:45:19:396  488 1470 PT WARNING: GetCookie_WithRecovery failed : 0x80072ee2
2015-05-19 11:45:19:396  488 1470 PT WARNING: RefreshCookie failed: 0x80072ee2
2015-05-19 11:45:19:396  488 1470 PT WARNING: RefreshPTState failed: 0x80072ee2
2015-05-19 11:45:19:396  488 1470 PT WARNING: Sync of Updates: 0x80072ee2
2015-05-19 11:45:19:396  488 1470 PT WARNING: SyncServerUpdatesInternal failed: 0x80072ee2
2015-05-19 11:45:19:396  488 1470 Agent   * WARNING: Failed to synchronize, error = 0x80072EE2
2015-05-19 11:45:22:813  488 1470 Agent   * WARNING: Exit code = 0x80072EE2

WUAUHandler.log

OnSearchComplete - Failed to end search job. Error = 0x80072ee2. WUAHandler 18-May-15 08:51:00 5700 (0x1644)
Scan failed with error = 0x80072ee2. WUAHandler 18-May-15 08:51:00 5700 (0x1644)

ScanAgent.log

ScanJob({15938E9B-160C-4383-9789-97EEFC35AB39}): CScanJob::OnScanComplete -Scan Failed with Error=0x80072ee2 ScanAgent 19-May-15 11:45:24 2448 (0x0990)
ScanJob({15938E9B-160C-4383-9789-97EEFC35AB39}): CScanJobManager::OnScanComplete- failed at CScanJob::OnScanComplete with error=0x80072ee2 ScanAgent 19-May-15 11:45:24 2448 (0x0990)

Now going to IIS logs on  the WSUS server à found this :

So, a lot of 500.0 status that translates to Internal server error.

Checking, the event log, I found a lot of events Event ID 5013 — IIS Application Pool Availability

Event info mention : WsusPool

The time errors 500.0 occurs on IIS match th etime errors are reported by the client.

Also found this in IIS logs :

Do you have any idea to troubleshoot this error ?

Regards,

Michel