Authentication Failure

["Paul Yang" <pyang () fporch com>]

Hi,
 
            I am a new snort user. The installation went well until the
snort center try to connect the sensor. The following error occurred:
 
ERROR; Access denied for x.x.x.x. The host been blocked because of too
many authentication failure.
 
I am using tow different redhat 7.3 machines for center and sensor. The
both are in the same subnets on ethernet0. 
 
Has anyone had a similar problem before? 
 
Thanks,
 
Paul