SBS2011, Exchange 2010 http version error

Question

Hello Guys,

i am having the following error

Activesync is not working

Server Error in Application "DEFAULT WEB SITE/MICROSOFT-SERVER-ACTIVESYNC"
Internet Information Services 7.5

Error Summary
HTTP Error 505.0 - Http Version Not Supported
The page cannot be displayed because the HTTP version is not supported.
Detailed Error Information
Module ManagedPipelineHandler
Notification ExecuteRequestHandler
Handler AirSyncHandler
Error Code 0x00000000
Requested URL https://127.0.0.1:443/Microsoft-Server-ActiveSync/default.eas
Physical Path C:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\sync\default.eas
Logon Method Basic
Logon User leander
Most likely causes:
The server does not support the HTTP version requested by the client.
Things you can try:
Verify that the client is requesting an invalid or unsupported HTTP version.
Links and More Information
This error occurs when a client is requesting an invalid HTTP version. This can occur if the client is requesting an older, unsupported HTTP version. You can create a network trace to troubleshoot this issue.
View more information »

Answer 1

Hi @leander lena ,

Good day!

How did you received this error messages? Were you trying to open the ActiveSync URL like https://localhost/Microsoft-Server-ActiveSync?
If so, then it is expected to receive the error like this. It's not designed to be opened in a browser.

If not, then something in ActiveSync might be broken.
Please try using the following command to test the ActiveSync:

$Cred = Get-Credential  
Test-ActiveSyncConnectivity -ClientAccessServer CAS -MailboxCredential $Cred  

And these methods may work:

1. Reset the ActiveSync Virtual Directory: Remove-ActiveSyncVirtualDirectory contoso\Microsoft-Server-ActiveSync and New-ActiveSyncVirtualDirectory -WebSiteName "Default Web Site"
2. Check the certificate bind with IIS.
3. Add Negotiate to Windows Authentication in IIS: Default First Web Site > Microsoft-Server-ActiveSync > proxy > Authentication > Windows Authentication > Providers > Add Negotiate if it's not on the list.
   

Best regards,
Lou

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