1、oracle>network administration>net8 configuration assist>配置本地网络服务名
2、http://www.dbforums.com/
搜索一下了!好象说是网络层有问题吧!
TNS-12571 TNS:packet writer failure
Intermittent SQL*Net TCP/IP read and write errors are sometimes
encountered on NT. The underlying reasons of these errors are a
synchronization error in the TCP/IP layer on NT.