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The remote SSL server is using a certificate which has been revoked.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 '\xb0\xb7\x13\x3e\xd0\x96\xf9\xb5\x6f\xae\x91\xc8\x74\xbd\x3a\xc0' 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.