M/S的奇怪问题??

M/S的主从复制,现在的问题是,执行查询SQL后,数据库报:ERROR 2013 (HY000): Lost connection to MySQL server during query的错误

此时查看从库的状态:
show slave status\G;

Slave_IO_Running: No
Slave_SQL_Running: Yes

请问这是什么原因?该如何解决?

Taxonomy upgrade extras:

看看错误日志中有什么
有可能是复制账号权限的问题

应该不是复制帐号的权限问题,复制帐号rep的权限现在已经给到了除了Grant之外的所有,以下是从库数据库的错误日志,我截取了一部分,请各位帮忙看一下
顺便说一句,为了排除网络或者防火墙的原因,主从机器上的防火墙全部关掉了,网络也正常
**********************************************
100406 15:26:24 [Note] Slave I/O thread killed during or after a reconnect done to recover from failed read
100406 15:26:24 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.000114', position 240457997
100406 15:26:24 [Note] Error reading relay log event: slave SQL thread was killed
100406 15:26:38 [Note] Slave SQL thread initialized, starting replication in log 'mysql-bin.000115' at position 106, relay log './13
test-server1-relay-bin.000001' position: 4
100406 15:26:38 [Note] Slave I/O thread: connected to master 'rep@192.168.160.144:3306',replication started in log 'mysql-bin.000115
' at position 106
100406 15:52:24 [ERROR] Error reading packet from server: Lost connection to MySQL server during query ( server_errno=2013)
100406 15:52:24 [Note] Slave I/O thread: Failed reading log event, reconnecting to retry, log 'mysql-bin.000115' at postion 23512696
7
100406 15:52:24 [ERROR] Slave I/O: error reconnecting to master 'rep@192.168.160.144:3306' - retry-time: 60 retries: 86400, Error_c
ode: 2013
100406 15:53:24 [Note] Slave: connected to master 'rep@192.168.160.144:3306',replication resumed in log 'mysql-bin.000115' at positi
on 235126967
100406 15:53:25 [ERROR] Error reading packet from server: Lost connection to MySQL server during query ( server_errno=2013)
100406 15:53:25 [Note] Slave I/O thread: Failed reading log event, reconnecting to retry, log 'mysql-bin.000116' at postion 106
100406 15:53:25 [ERROR] Slave I/O: error reconnecting to master 'rep@192.168.160.144:3306' - retry-time: 60 retries: 86400, Error_c
ode: 2013
100406 15:54:23 [Note] Slave I/O thread killed during or after a reconnect done to recover from failed read
100406 15:54:23 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.000116', position 106
100406 15:54:23 [Note] Error reading relay log event: slave SQL thread was killed
100406 15:54:32 [Note] Slave SQL thread initialized, starting replication in log 'mysql-bin.000120' at position 106, relay log './13
test-server1-relay-bin.000001' position: 4
100406 15:54:32 [Note] Slave I/O thread: connected to master 'rep@192.168.160.144:3306',replication started in log 'mysql-bin.000120
' at position 106
100406 15:55:23 [ERROR] Error reading packet from server: Lost connection to MySQL server during query ( server_errno=2013)
100406 15:55:23 [Note] Slave I/O thread: Failed reading log event, reconnecting to retry, log 'mysql-bin.000120' at postion 298
100406 15:55:23 [ERROR] Slave I/O: error reconnecting to master 'rep@192.168.160.144:3306' - retry-time: 60 retries: 86400, Error_c
ode: 2013
100406 15:56:23 [Note] Slave: connected to master 'rep@192.168.160.144:3306',replication resumed in log 'mysql-bin.000120' at positi
on 298
100406 15:56:33 [Note] Slave I/O thread killed while reading event
100406 15:56:33 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.000122', position 297
100406 15:56:33 [Note] Error reading relay log event: slave SQL thread was killed

看起来像网络连接问题,可以考虑把相关几个timeout值加大点

我回头验证一下再来说,timeout值

mysql无法连接的一种特殊情况

遇到一个mysql无法连接的情况:

windows2003服务器, 客户端

两台计算机互ping正常,客户端telnet 服务器的mysql端口正常
mysql帐号密码没有错误
客户端使用代码就是连接不上服务器,用mysql.exe都不行

发现另一台客户端可以连接,mysql.exe也可以,

发现是客户端启用了workstation服务(windows默认启动,但是服务器因为安全原因屏蔽了)
现在是两台服务器互访(web 服务器访问 db服务器),结果两台服务器的workstation服务都必须关闭,就造成无法访问的情况

说了这么多不知道大家明白了没有T_T (哭了) 求助各位大大管理员同志救命!!!!!

是不是有掉包啊,怎么感觉网络很差的说