Your error is:
2014-03-10T18:52:38.151+01:00 [05852 warning 'Default'] [,0] SSL_IsVerifyEnabled: failed to open the product registry key. Falling back to default behavior: verification on. LastError = 0
Try to turn off SSL connection and try again. In converter-worker.xml <nfc><useSsl>false... and restart thw worker service.
HTH