Software :: Nagios 3 - Server Port Must Be An Integer

I am trying to monitor a Windows SQL Server, and I am receiving a "Server port must be an integer," error. NSclient++ is running and working properly. Here is the service and command

Command:
define command{
command_name check_nt_mssql_bufcache_hits
command_line $USER1$/check_nt -H $HOSTADDRESS$ -p $USER19$ -s $USER4$ }

Service:
define service{
use generic-service
host_name "host_name"
service_description mssql_bufcache_hits
check_command check_nt_mssql_bufcache_hits!80!50 }