Verify that the Update Services service, IIS and SQL are running on the server. Hi, I have installed WSUS on a Windows 2003 SP1 server. Verify that the Update Services service, IIS and SQL are running on the server. ---> System.Net.WebException: The remote server returned an error: (407) Proxy Authentication Required. Problem Also bounced the server, still the same thing. WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. .NET 4.6 and above. This happens when the server denies tlsv1.0 or tlsv1.0 is disabled from the server side. System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. Sometimes when you invoke a webservice the call fails with the following exception: System.Net.WebException: The underlying connection was closed… Hi, Recently i was facing issue with one of my WSUS server was not getting Synced with my CAS WSUS server. at System.Web.Services.Protocols.WebClientProtocol.GetWebResponse(WebRequest request) I have been able to sync once but that was several days ago and I had to reboot the SCCM server to get it to work. It's failing because the WSUS server has an expired or untrusted SSL certificate for Microsoft. SCCM Reporting Services The underlying connection was closed. If the problem persists, try restarting IIS, SQL, and the Update Services Service. Before I do, I have a few questions. You don’t need to do any additional work to support TLS 1.2, it’s supported by default..NET 4.5. Wsus synchronization error webexception the underlying connection was closed. System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.# This System.Net.WebException obviously has something to do with an SSL/TLS secure connection and certificates. So I have noticed three main issues; 1. After doing some research, I found that there are some methods in the reporting services web services API that are inherently secure methods and if SSL is configured on a report server instance these methods cannot be invoked via http and require https connections. The WSUS administration console was unable to connect to the WSUS Server via the remote API. 'System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. Thanks for this, helped to fix the sync issues I was having here, saved me a great deal of time. The WSUS administration console was unable to connect to the WSUS Server via the remote API. Reason: The underlying connection was closed: Unable it successfully synced one time but then started failing the next time it attempted to sync. From what I can tell here and here I need to rip out the SUP, WSUS and SUSDB and reinstall SUP and WSUS. The entire certificate infrastructure for the Microsoft WU system was replaced in June, 2012 (and through subsequent months and additional updates). "The underlying connection was closed A connection that was expected to be kept alive was closed by the server" ... it popped up whether to keep the url in its secure zone, i added it and tried to synchronise the wsus again and that was it. 3. : 2. After searching around a bit, I found out why WSUS 3.0 SP2 is not offering the more advanced cipher suites during handshake: On Server 2003 SP2 and Server 2008 R2 SP1, WSUS binaries are built against .Net Framework 2.0, which does not support TLS beyond 1.0. Under Connections, type the number of seconds that you want in the Connection time-out box, and then click OK. If the problem persists, try restarting IIS, SQL, and the Update Services Service. To resolve the PowerShell “underlying connection was closed” error, in your PowerShell script enable TLS: Add the following line before your Invoke-RestMethod or Invoke-WebRequest call; [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls -bor I upgraded SCCM to 1906. > It should say something like: "WebException: The underlying connection > was closed: Unable to connect to the remote server. It’s great when you can actually find reliable, straight to the point information that fixes the issue. The WSUS administration console was unable to connect to the WSUS Server via the remote API. Find answers to Wsus no longer synchronising from the expert community at Experts Exchange environment details: SCCM CB 1606 1 CAS, on same box WSUS server is also installed 2 Primary server in different geographical locations In one primary server WSUS was getting synced with CAS wsus without… ---> System.Security.Authentication.AuthenticationException: The remote certificate is invalid according to the validation procedure. This is related to TLS, Just upgrade the .net to the latest version. ---> System.Net.WebException: The remote server returned an error: (400) Bad Request. The complete System.Net.WebException our client received was: WebException: The underlying connection was closed: Unable to connect to the remote server. “Exception Type: System.Net.WebException Exception Message: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.” Dr Google immediately indicated the issue was lack of tls1.0 support on the provider end … damn them for not telling us …so I took the recommended medication and added: For last few years I have been working on multiple technologies such as SCCM / Configuration Manager, Intune, Azure, Security etc. Exception: System.Net.WebException: The request failed with HTTP status 503: Service Unavailable. The install was fine but when I try to synchronize the server I get the following message: WebException: The underlying connection was closed: Unable to connect to the remote server. System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> > System.Net.WebException: The remote server returned an error: ..." It did.. and Justin did.. from an earlier post of Justin's: >WebException: The underlying connection was closed: An unexpected error Right-click the virtual server that you want to configure, and then click Properties. This is the WSUS server attempting to initiate an HTTPS connection to do the synchronization. When looking at the produced temp file, it showed the following. Application Event log Info: Source: Windows Server Update Category: Synchronization Event ID: 386 Synchronization failed. Since this, my sync is intermittent. Verify that the Update Services service, IIS and SQL are running on the server. Home; About; My account; Contact Us But the post-config failed. Verify that the Update Services service , IIS and SQL are running on the server . ---> System.Security.Authentication.AuthenticationException: The remote certificate is invalid according to the validation procedure. If the problem persists , try restarting IIS , SQL , and the Update Services Service . I managed to use the MEMCM Messaging SDK to fetch and apply the configuration baselines that a client has been assigned. As long as the Messaging SDK DLLs are downloaded and placed in the functions folder the scripts will work "out of the box" but if the client … Sync failed: UssCommunicationError: WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. The underlying connection was closed. 2015-03-18 20:43:04 CreateDefaultSubscription failed. Did I miss anything before I go through and re-install SUP and WSUS? It will try 3 times, then fail..with retry limit. UPDATE: For solution when using WSE, see here! Click the Web Site tab. Click Start, point to All Programs, point to Administrative Tools, and then click Internet Information Services (IIS) Manager. Hi, I am Prajwal Desai. ---> System.Security.Authentication.AuthenticationException: The remote certificate is invalid according to the validation procedure.~~ at System.Net.Security.SslState.StartSendAuthResetSignal(ProtocolToken… Setting the HttpWebRequest.KeepAlive to false didn't work for me. TLS 1.2 is supported, but it’s not a default protocol. Sync Failed: USSCommunicationError: WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel Cause This problem occurs because the WSUS application on the server is not SHA2-compliant. I have checked IIS, SQL and WSUS services and they are running. Could not establish trust relationship for the SSL/TLS secure channel. In this article we will be seeing how to resolve the following issue "The underlying connection was closed. If the problem persists, try restarting IIS, SQL, and the Update Services Service. connect to the remote server. The WSUS administration console was unable to connect to the WSUS Server via the remote API. Could not establish trust relationship for the SSL/TLS secure channel". Since I was accessing a HTTPS page I had to set the Service Point Security Protocol to Tls12. 1. Due to the high CPU usage, most of the clients were failed to complete the scan and as well as the upstream server failed to complete the update sync.