Exchange 2010 ActiveSync not working - where do I start?

Hi, I have read other threads but cant seem to find the best way to approach and fix the problems I am having with my exchange activesync. Below are the results of the test tool. Which area should I address first and how can I fix the problem? I cannot receieve mail internally or access mail externally. Many thanks in advance.

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Connectivity Test Failed Test Details <input class=" __ecpStyleButton" id="testSelectWizard_ctl12_btnExpandAll" name="testSelectWizard$ctl12$btnExpandAll" style="background-image:url("/Images/expand.gif");" type="submit" value="Expand All" /><input class=" __ecpStyleButton" id="testSelectWizard_ctl12_btnCopyClipboard" name="testSelectWizard$ctl12$btnCopyClipboard" style="border-left-color:#cccccc;border-left-width:1px;border-left-style:solid;background-image:url("/Images/copy.gif");" type="submit" value="Copy to Clipboard" /> ExRCA is testing Exchange ActiveSync. The Exchange ActiveSync test failed. Test Steps Attempting the Autodiscover and Exchange ActiveSync test (if requested). Testing of Autodiscover for Exchange ActiveSync failed. Test Steps Attempting each method of contacting the Autodiscover service. The Autodiscover service couldn't be contacted successfully by any method. Test Steps Attempting to test potential Autodiscover URL https://greencoll.com/AutoDiscover/AutoDiscover.xml Testing of this potential Autodiscover URL failed. Test Steps Attempting to resolve the host name greencoll.com in DNS. The host name resolved successfully. Additional Details IP addresses returned: x.x.x.x Testing TCP port 443 on host greencoll.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. Test Steps ExRCA is attempting to obtain the SSL certificate from remote server greencoll.com on port 443. ExRCA successfully obtained the remote SSL certificate. Additional Details Remote Certificate Subject: CN=*.justhost.com, OU=PositiveSSL Wildcard, OU=Domain Control Validated, Issuer: CN=PositiveSSL CA, O=Comodo CA Limited, L=Salford, S=Greater Manchester, C=GB. Validating the certificate name. Certificate name validation failed. <label for="testSelectWizard_ctl12_ctl06_ctl00_ctl00_ctl00_ctl02_ctl01_tmmArrow">Tell me more about this issue and how to resolve it</label> Additional Details Host name greencoll.com doesn't match any name found on the server certificate CN=*.justhost.com, OU=PositiveSSL Wildcard, OU=Domain Control Validated. Attempting to test potential Autodiscover URL https://autodiscover.greencoll.com/AutoDiscover/AutoDiscover.xml Testing of this potential Autodiscover URL failed. Test Steps Attempting to resolve the host name autodiscover.greencoll.com in DNS. The host name resolved successfully. Additional Details IP addresses returned: x.x.x.x Testing TCP port 443 on host autodiscover.greencoll.com to ensure it's listening and open. The specified port is either blocked, not listening, or not producing the expected response. <label for="testSelectWizard_ctl12_ctl06_ctl00_ctl00_ctl01_ctl01_tmmArrow">Tell me more about this issue and how to resolve it</label> Additional Details A network error occurred while communicating with the remote host. Attempting to contact the Autodiscover service using the HTTP redirect method. The attempt to contact Autodiscover using the HTTP Redirect method failed. Test Steps Attempting to resolve the host name autodiscover.greencoll.com in DNS. The host name resolved successfully. Additional Details IP addresses returned: x.x.x.x Testing TCP port 80 on host autodiscover.greencoll.com to ensure it's listening and open. The port was opened successfully. ExRCA is checking the host autodiscover.greencoll.com for an HTTP redirect to the Autodiscover service. ExRCA failed to get an HTTP redirect response for Autodiscover. Additional Details Exception details: Message: The underlying connection was closed: An unexpected error occurred on a receive. Type: System.Net.WebException Stack trace:    at System.Net.HttpWebRequest.GetResponse()    at Microsoft.Exchange.Tools.ExRca.Tests.AutoDiscover.AutoDiscHttpRedirectTest.PerformTestReally() Exception details: Message: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. Type: System.IO.IOException Stack trace:    at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)    at System.Net.PooledStream.Read(Byte[] buffer, Int32 offset, Int32 size)    at System.Net.Connection.SyncRead(HttpWebRequest request, Boolean userRetrievedStream, Boolean probeRead) Exception details: Message: An existing connection was forcibly closed by the remote host Type: System.Net.Sockets.SocketException Stack trace:    at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size) Attempting to contact the Autodiscover service using the DNS SRV redirect method. ExRCA failed to contact the Autodiscover service using the DNS SRV redirect method. Test Steps Attempting to locate SRV record _autodiscover._tcp.greencoll.com in DNS. The Autodiscover SRV record wasn't found in DNS. <label for="testSelectWizard_ctl12_ctl06_ctl00_ctl00_ctl03_ctl00_tmmArrow">Tell me more about this issue and how to resolve it</label>

<input class=" __ecpStyleButton" id="testSelectWizard___CustomNav3_buttonStartOver" name="testSelectWizard$__CustomNav3$buttonStartOver" style="background-image:url("/Images/ButtonsPanelStartOver16.png");" type="submit" value="Start Over" /><input class=" __ecpStyleButton" id="testSelectWizard___CustomNav3_buttonRunAgain" name="testSelectWizard$__CustomNav3$buttonRunAgain" style="border-left-color:#cccccc;border-left-width:1px;border-left-style:solid;background-image:url("/Images/ButtonsPanelBack16.gif");" type="submit" value="Run Test Again" />

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