Hello. from twisted.enterprise import adbapi from twisted.internet import reactor from twisted.spread import pb DB_HOST = "localhost" DB_USER = "root" DB_PASSWD = "xxx" DB_NAME = "account" class DBException(pb.Error): pass dbpool = adbapi.ConnectionPool("MySQLdb", host=DB_HOST, user=DB_USER, passwd=DB_PASSWD, db=DB_NAME) # Database checking def getClientsDBParams(username): _sql = """ SELECT username, password, ip, netmask, mac FROM bunkernet_clients WHERE username='%s' """ % username return dbpool.runQuery(_sql) def dbClientSucceeded(self, l): if l: print l else: print "no records" raise DBException("No records") def dbClientFailed(): print "Failed!" reactor.stop() getClientsDBParams('alienoid').addCallbacks(dbClientSucceeded, dbClientFailed) reactor.run() The problem here is that when dbClientSucceeded is executed and i get "no records" - i don't get exception. Only when i press Ctrl + C on server i get those DBException. This code will be executed when remote client connects to server and i want those DBException be passed to remote client but i can't get it, can get it only with Ctrl + C Your help is very appreciated. Thanks in advance. Best regards, Ruslan