Hello
To resolve the DirectAccess connectivity issue, first confirm the error source by running netsh interface httpstunnel show interface to check the tunnel's status. Use certutil -urlfetch -verify to validate the server's certificate chain and ensure the client can access the Certificate Revocation List, as blocked access here prevents successful handshakes. Verify that the necessary certificates are correctly installed in the local machine's personal and root stores, and confirm that the certificate's Subject Alternative Name matches the configured public URL. Finally, ensure that your perimeter firewalls are not performing SSL inspection on the DirectAccess traffic, as this process interferes with the tunnel's integrity and must be bypassed.
VPHAN