sql Module error

hi, all:

sql Module 4.1.networker 7.1.

Here are some error message:

07/31/09 14:47:32 nsrd: gdoaback:MSSQL: done saving to pool 'Default' (AAR403B) 9458 MB
07/31/09 14:47:32 nsrd: gdoaback:MSSQL: saving to pool 'Default' (AAR403B)
07/31/09 14:47:34 nsrd: gdoaback:MSSQL: done saving to pool 'Default' (AAR403B) 16 MB
07/31/09 14:47:34 nsrd: gdoaback:MSSQL: saving to pool 'Default' (AAR403B)
07/31/09 14:47:34 nsrd: gdoaback:MSSQL: done saving to pool 'Default' (AAR403B) 852 KB
07/31/09 14:47:34 nsrd: gdoaback:MSSQL: saving to pool 'Default' (AAR403B)
07/31/09 14:47:42 nsrd: gdoaback:MSSQL: done saving to pool 'Default' (AAR403B) 15 MB
07/31/09 14:47:42 nsrd: gdoaback:MSSQL: saving to pool 'Default' (AAR403B)
07/31/09 14:47:43 nsrd: gdoaback:MSSQL: done saving to pool 'Default' (AAR403B) 1747 KB
07/31/09 14:47:44 nsrd: gdoaback:MSSQL: saving to pool 'Default' (AAR403B)
07/31/09 14:48:17 nsrd: gdoaback:MSSQL: done saving to pool 'Default' (AAR403B) 124 MB
07/31/09 14:48:17 nsrd: gdoaback:MSSQL: saving to pool 'Default' (AAR403B)
07/31/09 14:48:17 nsrd: gdoaback:MSSQL: done saving to pool 'Default' (AAR403B)
07/31/09 14:48:52 nsrd: write completion notice: Writing to volume AAR403B complete
07/31/09 14:50:09 nsrd: savegroup info: starting moniter_web (with 1 client(s))
07/31/09 14:50:38 nsrd: gdoaback:MSSQL:gdyj2 saving to pool 'Default' (AAR403B)
07/31/09 15:08:37 nsrd: gdoaback:MSSQL:gdyj2 done saving to pool 'Default' (AAR403B) 9458 MB
07/31/09 15:09:11 nsrd: write completion notice: Writing to volume AAR403B complete
07/31/09 15:17:48 nsrd: gdoaback: browsing
07/31/09 15:17:58 nsrd: gdoaback: done browsing
07/31/09 16:50:16 nsrd: savegroup alert: moniter_web completed, total 1 client(s), 0 Hostname(s) Unresolved, 1 Failed, 0 Succeeded. (gdoaback Failed)
* gdoaback:MSSQL:gdyj2 ! no output
07/31/09 16:50:17 nsrd: runq: NSR group moniter_web exited with return code 1.
----------------
and in the client,the applogs-->xbsa.messages
show ¿XBSA-1.0.1 LNMs_2004.Build.233 5828 Fri Jul 31 09:30:15 2009 BSAEndTxn: received a network error¿

what's wrong with my system?