An HTTP error occurred

hello! me how solve problem please:

when try synchronize ms first time (and other time after that) in first-time configuration wizard, error:
webexception: underlying connection closed: not establish trust relationship ssl/tls secure channel. ---> system.security.authentication.authenticationexception: remote certificate invalid according validation procedure.
@ system.web.services.protocols.webclientprotocol.getwebresponse(webrequest request)
   @ system.web.services.protocols.httpwebclientprotocol.getwebresponse(webrequest request)
   @ microsoft.updateservices.serversync.serversynccompressionproxy.getwebresponse(webrequest webrequest)
   @ system.web.services.protocols.soaphttpclientprotocol.invoke(string methodname, object[] parameters)
   @ microsoft.updateservices.serversyncwebservices.serversync.serversyncproxy.getauthconfig()
   @ microsoft.updateservices.serversync.serversynclib.internetgetserverauthconfig(serversyncproxy proxy, webservicecommunicationhelper webservicehelper)
   @ microsoft.updateservices.serversync.serversynclib.authenticate(authorizationmanager authorizationmanager, boolean checkexpiration, serversyncproxy proxy, cookie cookie, webservicecommunicationhelper webservicehelper)
   @ microsoft.updateservices.serversync.catalogsyncagentcore.syncconfigupdatesfromuss()
   @ microsoft.updateservices.serve

hi lion,

>webexception: underlying connection closed: not establish trust relationship ssl/tls secure channel. ---> system.security.authentication.authenticationexception: remote certificate invalid according validation procedure.

do use proxy wsus server when sync?

what version of wsus server, upgrade latest version?

according error, seems issue related certificate, default, system store root certificate trust ms sites, may check if certificates on wsus server correct.

best regards,

anne

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