Oracle TNS-12519: TNS:no appropriate service handler found

 Oracle10.2.0.1 , Centos 4.4
При увеличении нагрузки в логах следующее:

22-JUN-2007 05:24:34 * (CONNECT_DATA=(SID=aaaaa)(CID=(PROGRAM=)(HOST=__jdbc__)(USER=))) * (ADDRESS=(PROTOCOL=tcp)(HOST=xxxxxxxxx)(PORT=52175)) * establish * aaaaa * 12519
TNS-12519: TNS:no appropriate service handler found
* (CONNECT_DATA=(SID=aaaaa)(CID=(PROGRAM=)(HOST=__jdbc__)(USER=))) * (ADDRESS=(PROTOCOL=tcp)(HOST=xxxxxxxx)(PORT=52177)) * establish * aaaaa* 12519
TNS-12519: TNS:no appropriate service handler found
22-JUN-2007 05:24:35 * (CONNECT_DATA=(SID=aaaa)) * (ADDRESS=(PROTOCOL=tcp)(HOST=xxxxxxxx)(PORT=3790)) * establish * aaaaa * 12519
TNS-12519: TNS:no appropriate service handler found
* (CONNECT_DATA=(SID=aaaa)) * (ADDRESS=(PROTOCOL=tcp)(HOST=xxxxxxxx)(PORT=3793)) * establish * aaaa * 12519
TNS-12519: TNS:no appropriate service handler found
22-JUN-2007 05:24:39 * (CONNECT_DATA=(SID=aaaa)) * (ADDRESS=(PROTOCOL=tcp)(HOST=xxxxxxxx)(PORT=3794)) * establish * aaaaa * 12519

После спадания нагрузки работа нормальная.
Какие у кого были решения?
Спасибо....