I am receiving the bellow error on my WSUS 2016 Enterprise server patch version 1803.
I have tried to fix this, using the additional memory method, cleaning up the DB, changing the .net version etc..
Still does not work correctly, it seems to be fine, then bam, just freezes with the below error, which requires a server reboot to clear. I have attempted IISReset, and also restarting the WWW publishing services, to no avail.
I have also rebuilt the server twice, thinking that would help, first rebuild was from 2012R2 where this occurred, to 2016 1607 version with the original DB details,.. Same error eventually.. Then a fresh rebuild with a new server name.. same issue occurs.. I have googled this and it appears common yet no one has yet to fix it..
The WSUS administration console was unable to connect to the WSUS Server via the remote API. Verify that the Update Services service, IIS and SQL are running on the server. If the problem persists, try restarting IIS, SQL, and the Update Services Service. System.Net.WebException -- The request failed with HTTP status 503: Service Unavailable. Source System.Web.Services Stack Trace: at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall) at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) at Microsoft.UpdateServices.Internal.ApiRemoting.ExecuteSPGetConfiguration() at Microsoft.UpdateServices.Internal.DatabaseAccess.AdminDataAccessProxy.ExecuteSPGetConfiguration() at Microsoft.UpdateServices.Internal.BaseApi.UpdateServerConfiguration.Load() at Microsoft.UpdateServices.Internal.ClassFactory.CreateWellKnownType(Type type, Object[] args) at Microsoft.UpdateServices.Internal.ClassFactory.CreateInstance(Type type, Object[] args) at Microsoft.UpdateServices.Internal.BaseApi.UpdateServer.GetConfiguration() at Microsoft.UpdateServices.UI.AdminApiAccess.CachedObject.RefreshCache() at Microsoft.UpdateServices.UI.AdminApiAccess.CachedObject.GetFromCache() at Microsoft.UpdateServices.UI.AdminApiAccess.PermissionsManager.IsPermitted(UserOperation operation) at Microsoft.UpdateServices.UI.SnapIn.Scope.UpdatesSummaryScopeNode.RefreshPermissions() at Microsoft.UpdateServices.UI.SnapIn.Scope.ServerSummaryScopeNode.AddChildNodes() at Microsoft.UpdateServices.UI.SnapIn.Scope.ServerSummaryScopeNode.ConnectToServerAndPopulateNode(Boolean connectingServerToConsole) at Microsoft.UpdateServices.UI.SnapIn.Scope.ServerSummaryScopeNode.ResetScopeNode()
Rob