![]() This is true for both upstream and downstream WSUS servers. If you store update files on your WSUS server, you need to ensure that the folder to which you download update files (by default C:\WSUS) has at least Read permissions for the network service and for users. Verify that users and the network service have Read permissions to the local update storage directory Where WSUSServerName is the name of the upstream WSUS server with which you are trying to synchronize. Type the following, and then press ENTER: In the Open box, type cmd, and then click OK. To contact an upstream WSUS server by using the ping command To work around this type of issue, you could use a different name resolution service or the IP address of the upstream server. If you cannot ping the upstream server, you might have a problem with network name resolution services. For example, if you used a NetBIOS name in WSUS console, use the NetBIOS name of the upstream server with the ping command. ![]() You should use the same naming convention that is used in the WSUS console. To determine if there is a problem with network name resolution services, use the ping command from the downstream WSUS server that cannot synchronize. The name that you enter in the WSUS console on the downstream WSUS server must match the name of the upstream WSUS server. For basic instruction about synchronizing two WSUS servers, see Deploying Microsoft Windows Server Update Services ( ). If your WSUS uses another WSUS server as its update source, make sure you are using the correct name for the upstream WSUS server and that you have spelled it correctly. Check the name of the upstream WSUS server For more information, see Deploying Microsoft Windows Server Update Services ( ). If your network has a firewall between the WSUS server and the Internet, make sure that all the necessary ports are open and the necessary domains are allowed. Make sure the user name and password for the proxy server are always up to date. One major cause of synchronization failure is an expired password on the proxy server. Note that if you use the WSUS console option for Allow basic authentication (password in cleartext), the password for the account is sent over the network in unencrypted text. If your proxy server supports authentication, make sure you have the correct user name, password, and domain. For basic instructions about setting up a proxy server, see Deploying Microsoft Windows Server Update Services ( ). If your WSUS server is connected to Microsoft Update via a proxy server, you must use the WSUS console to configure WSUS so that it can access the Internet. Check proxy server settings by using the WSUS console If neither of the retries succeeds, the downstream server will try again the next day at the scheduled synchronization time. ![]() If the upstream WSUS server is not available for synchronization from a downstream server at the scheduled time, the downstream server will try to synchronize twice more, at approximately 15 minute intervals. ![]() Synchronization retries by downstream servers ![]() In the Synchronization Details pane you will see Details, which links to the full error description. If a synchronization has failed, in the WSUS administration console, go to the Synchronizations node, and in the middle pane select the failed synchronization. Troubleshooting synchronization Check the error in the synchronization's Details pane If synchronizations are failing, you can use the information below to troubleshoot the problem. If it is your first time synchronizing WSUS, all updates are made available for approval. During synchronization, WSUS determines if any new updates have been made available since the last time you synchronized. Synchronization is the process in which the WSUS server connects to Microsoft Update or another WSUS server and downloads updates. ![]()
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