Error Connecting to WSUS Server

have 2008 r2 server serves our wsus server. when open wsus, comes following message:

error: connection error

an error occured trying conect wsus server. error can happen number of reasons. check connectivity server.

i copied error clipboard , have posted below. i've tried rebooting didn't fix it. other ideas?

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the wsus administration console unable connect wsus server via remote api. 

verify update services service, iis , sql running on server. if problem persists, try restarting iis, sql, , update services service.

the wsus administration console has encountered unexpected error. may transient error; try restarting administration console. if error persists, 

try removing persisted preferences console deleting wsus file under %appdata%\microsoft\mmc\.


system.io.ioexception -- handshake failed due unexpected packet format.

source
system

stack trace:
   at system.net.security.sslstate.startreadframe(byte[] buffer, int32 readbytes, asyncprotocolrequest asyncrequest)
   at system.net.security.sslstate.startreceiveblob(byte[] buffer, asyncprotocolrequest asyncrequest)
   at system.net.security.sslstate.forceauthentication(boolean receivefirst, byte[] buffer, asyncprotocolrequest asyncrequest)
   at system.net.security.sslstate.processauthentication(lazyasyncresult lazyresult)
   at system.threading.executioncontext.runtrycode(object userdata)
   at system.runtime.compilerservices.runtimehelpers.executecodewithguaranteedcleanup(trycode code, cleanupcode backoutcode, object userdata)
   at system.threading.executioncontext.run(executioncontext executioncontext, contextcallback callback, object state)
   at system.net.tlsstream.processauthentication(lazyasyncresult result)
   at system.net.tlsstream.write(byte[] buffer, int32 offset, int32 size)
   at system.net.pooledstream.write(byte[] buffer, int32 offset, int32 size)
   at system.net.connectstream.writeheaders(boolean async)
** exception nested inside of following exception **


system.net.webexception -- underlying connection closed: unexpected error occurred on send.

source
microsoft.updateservices.administration

stack trace:
   at microsoft.updateservices.administration.adminproxy.createupdateserver(object[] args)
   at microsoft.updateservices.administration.adminproxy.getupdateserver(string servername, boolean usesecureconnection, int32 portnumber)
   at microsoft.updateservices.ui.adminapiaccess.adminapitools.getupdateserver(string servername, boolean usesecureconnection, int32 portnumber)
   at microsoft.updateservices.ui.snapin.scope.serversummaryscopenode.getupdateserver(persistedserversettings settings)
   at microsoft.updateservices.ui.snapin.scope.serversummaryscopenode.connecttoserver()
   at microsoft.updateservices.ui.snapin.scope.serversummaryscopenode.connecttoserverandpopulatenode(boolean connectingservertoconsole)
   at microsoft.updateservices.ui.snapin.scope.serversummaryscopenode.onexpandfromload(syncstatus status)

it must have been database. disconnecting , reconnecting database fixed issue.

Windows Server  >  WSUS