In your loginserver folder there is a file called "AllowStatus.sdb" it's pretty self explanatory although here is the example:
Status,Allow,RejectText, A,TRUE,, B,FALSE,Account not approved yet, C,FALSE,Banned for dating GMs GF, D,FALSE,Your mom called and said no more A3, E,FALSE,Noobs not allowed, F,TRUE,, G,TRUE,, H,TRUE,,
Just edit this file and make sure that the status field in the "asd"."account" table has the proper value.
Credits: ChrissDeGrece
http://forum.ragezone.com/f98/how-to-restrict-access-ban-and-display-reason-in-client-643775/