File system backup over firewall with Channel error. In the subtext of the binary log we see “Data Channel Connect: FAILURE”. This indicates network issue.
Enabled trace on the client and we see “Unexpected response from NetConnect” in the file system trace
Traced network activity of backup with tcpdump but wireshark would do just as well. Looking at the tcpdump trace we saw a TCP/IP reset.
From netvault server binary log:
Job Message 2013/06/03 21:17:21 633 Data Plugin olb_db1 File System 7.8.1 Backup
Job Message 2013/06/03 21:17:22 633 Media nvserver (nvserver: V:\VDL) Media in 'DRIVE 6:nvserver' assigned to job ready for data transfer
Information 2013/06/03 21:17:22 633 Media nvserver Using network socket for data transfer
Error 2013/06/03 21:17:52 633 Media nvserver nvserver V:\VDL\drives\6: had channel error
Binary log subtext:
MEDWRITE:05524 165 0 64907 Got into WRITE_CONNECT state
DEVMGR :05524 776 0 64937 Data Channel Connect: FAILURE
Extract from file system trace on the client:
6 NET ??? 25179 59 0 141202967009 3 = NetConnect(9, 0x963a468)
0 DATA ??? 25179 181 0 141202967016 Unexpected response from NetConnect
6 NET ??? 25179 2 0 141202967028 TRUE = NetClose(0xff90d418) 9
0 PLGLIB ??? 25179 890 0 141202967039 DataChannelAcceptConnection failed
0 PLGLIB ??? 25179 1220 0 141202967044 Data Channel media allocation failed
0 PLGLIB ??? 25179 1129 0 141202967051 Failed to get media
0 PLGLIB ??? 25179 854 0 141202967055 Backup Stream Down
Cause :
Network in the firewall which miss-configured subnet mask, it was a configured as a /28-net but should have been /27-net. This reduced the IPaddress range allowed through the firewall and putting the client outside the configured IPaddress range
