Hi, I did an upgrade of the ssl certificate for our owa access last night and since then it is not possible to access OWA or use Activesync. I have checked the certificate and it all looks OK (it is from InstantSSL and I have used them before) If I login on the Exchange server and access OWA it all works fine but as soon as I try from an external computer, it will not work. I have done a test using www.testexchangeconnectivity.com and the result is a below: Testing RPC/HTTP connectivity. The RPC/HTTP test failed. Test Steps Attempting to resolve the host name mail.bindexis.com in DNS. The host name resolved successfully. Additional Details IP addresses returned: 94.228.33.189 Testing TCP port 443 on host mail.bindexis.com to ensure it's listening and open. The port was opened successfully. Testing the SSL certificate to make sure it's valid. The SSL certificate failed one or more certificate validation checks. Tell me more about this issue and how to resolve it Additional Details A network error occurred while communicating with the remote host. Exception details: Message: Authentication failed because the remote party has closed the transport stream. Type: System.IO.IOException 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.Net.Security.SslStream.AuthenticateAsClient(String targetHost) at Microsoft.Exchange.Tools.ExRca.Tests.SSLCertificateTest.PerformTestReally() Microsoft Windows Server 2003 R2 Standard X64 edition Service pack 2 Exchange 2007 Edition : Standard AdminDisplayVersion : Version 8.1 (Build 240.6) Any ideas? Karl

If you open the IIS and check the bindings is it listening on 443? Check the advanced tab as well.James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

Hi Karl, Any updates on this issue? Please follow James suggestion to check on the IIS. Here is a related document for you, hope it help: A Network Error Occurred while Communicating with Remote Host http://64.4.11.252/en-us/library/dd439386(EXCHG.80).aspx Thanks, EvanPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.