Outlook Anywhere 2010 (RPC over HTTP)

Hello,

I'm facing some troubles connecting with outlook 2010 to an Exchange 2010 server with outlook anywhere.
When I test my Exchange server 2010 on www.testexchangeconnectivity.com everything seems normal.

Testing RPC/HTTP connectivity.
 	The RPC/HTTP test completed successfully.
 	
	Test Steps
 	
	Attempting to resolve the host name hostedmail.domain.tld in DNS.
 	The host name resolved successfully.
 	
	Additional Details
 	IP addresses returned: x.x.x.x
	Testing TCP port 443 on hosthostedmail.domain.tld to ensure it's listening and open.
 	The port was opened successfully.
	Testing the SSL certificate to make sure it's valid.
 	The certificate passed all validation requirements.
 	
	Test Steps
 	
	Validating the certificate name.
 	The certificate name was validated successfully.
 	
	Additional Details
 	Host name hostedmail.domain.tld was found in the Certificate Subject Common name.
	Certificate trust is being validated.
 	The certificate is trusted and all certificates are present in the chain.
 	
	Additional Details
 	The certificate chain has been validated up to a trusted root. Root = CN=DigiCert High Assurance EV Root CA, OU=www.digicert.com, O=DigiCert Inc, C=US.
	Testing the certificate date to confirm the certificate is valid.
 	Date validation passed. The certificate hasn't expired.
 	
	Additional Details
 	The certificate is valid. NotBefore = 10/29/2010 12:00:00 AM, NotAfter = 11/5/2013 11:59:59 PM
	Checking the IIS configuration for client certificate authentication.
 	Client certificate authentication wasn't detected.
 	
	Additional Details
 	Accept/Require Client Certificates isn't configured.
	Testing HTTP Authentication Methods for URL https://hostedmail.domain.tld/rpc/rpcproxy.dll.
 	The HTTP authentication methods are correct.
 	
	Additional Details
 	ExRCA found all expected authentication methods and no disallowed methods. Methods found: Basic
	Testing SSL mutual authentication with the RPC proxy server.
 	Mutual authentication was verified successfully.
 	
	Additional Details
 	Certificate common name hostedmail.domain.tld matches msstd:hostedmail.domain.tld
	Attempting to ping RPC proxy hostedmail.domain.tld.
 	RPC Proxy was pinged successfully.
 	
	Additional Details
 	Completed with HTTP status 200 - OK
	Attempting to ping RPC endpoint 6001 (Exchange Information Store) on server mailsrv.
 	The endpoint was pinged successfully.
 	
	Additional Details
 	RPC Status Ok (0) returned in 279 ms.
	Testing the Name Service Provider Interface (NSPI) on the Exchange Mailbox server.
 	The NSPI interface was tested successfully.
 	
	Test Steps
 	
	Attempting to ping RPC endpoint 6004 (NSPI Proxy Interface) on server mailsrv.
 	The endpoint was pinged successfully.
 	
	Additional Details
 	RPC Status Ok (0) returned in 106 ms.
	Testing NSPI "Check Name" for user username@domain.tld against server mailsrv.
 	Check Name succeeded.
 	
	Additional Details
 	DisplayName: User Name, LegDN: /o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=username
	Testing the Referral service on the Exchange Mailbox server.
 	The Referral service was tested successfully.
 	
	Test Steps
 	
	Attempting to ping RPC endpoint 6002 (Referral Interface) on server mailsrv.
 	The endpoint was pinged successfully.
 	
	Additional Details
 	RPC Status Ok (0) returned in 70 ms.
	Attempting to perform referral for user /o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=Username on server mailsrv.
 	ExRCA successfully got the referral.
 	
	Additional Details
 	The server returned by the Referral service: mailsrv.windowsdomain.local
	Testing the Exchange Information Store on the Mailbox server.
 	ExRCA successfully tested the Information Store.
 	
	Test Steps

Select allOpen in new window

When I configure Outlook 2010 i get the message: the connection to MS exchange is not available. Outlook must be online...

In the firewall I see that my Outlook still wants to connect via port 135 (this attempt is blocked because only port 443 is open for the outside).


Any thoughts on this matter?