The remote host has been compromised and is running a 'Backdoor' program
The remote SSL server is using a certificate which has been revoked. The particular SSL certificate has a serial number of '\xd8\xf3\x5f\x4e\xb7\x87\x2b\x2d\xab\x06\x92\xe3\x15\x38\x2f\xb0' and an Issuer of USERTRUST.
There is a high probability that your server has been compromised. You should manually inspect and fix this system.