Error 2013 Error connecting to master (no replies)

Hello,
I set up the replication and it worked good. But yesterday it suddenly stopped working. The show slave status \G shows:

Slave_IO_Running: No
Last_IO_Errno: 2013
Last_IO_Error: error connecting to master 'ldata01@192.168.2.1:3036' - retry-time:60 retries: 86400

In the mysqld.log :

111207 0:10:12 [Note] Slave I/O thread killed while reading event
111207 0:10:12 [Note] Slave I/O thread exiting, read up to log 'mysql-bin-log.000022', position 46175456
111207 0:10:12 [Note] Event Scheduler: Purging the queue. 0 events

I googled about this problem but i could find the solution.

Can anyone help to resolve this problem?
Thanks in advance!