mySQL slave configration error

[Garey Guan]

hi, experts,
i have two server A(192.168.10.249) and B(192.168.10.250), all windows server2003 with mySQL 5.5.17-log, now i want to congigure the replication from A to B, A is the master:

step 1: stop A mysql service, add

server-id = 1
log-bin
binlog-do-db=reltest
to my.ini file, and start the service.

step 2: stop B mySQL service, add

server-id = 2
master-host=192.168.10.249
master-user=DBA
master-password = ******
master-port = 3306
master-connect-retry = 10
replicate-do-db = reltest

to my.ini configure file,but when i try to start the mySQL service on server B, got Error:
Could not start the mySQL servie on local computer
Error 1067:The process teminated unexpectedly.

even i ony add

server-id = 2
master-host=192.168.10.249

also got the same error, but if i only add

server-id = 2

can start the service, why if i configure the master-host then encounter error?
A and the same workgroup, network no isssue, pls help me, Thanks


Regards
Garey