The remote host has been compromised and is running a 'Backdoor' program
Description
The remote SSL server is using a certificate which has been revoked. The particular SSL certificate has a serial number of '\xd7\x55\x8f\xda\xf5\xf1\x10\x5b\xb2\x13\x28\x2b\x70\x77\x29\xa3' and an Issuer of USERTRUST.
Solution
There is a high probability that your server has been compromised. You should manually inspect and fix this system.