The thing is that there were no problems before.
FW02(M)-> get system
Product Name: SSG-550M
Serial Number: <serial number>, Control Number: 00000000
Hardware Version: REV 12(0)-(00), FPGA checksum: 00000000, VLAN1 IP (0.0.0.0)
Software Version: 6.3.0r11.0, Type: Firewall+VPN
Feature: AV-K
BOOT Loader Version: 1.0.7
Compiled by build_master at: Wed Mar 28 22:01:24 PDT 2012
Base Mac: <mac address>
File Name: screenos_image, Checksum: 90fd1c02
, Total Memory: 1024MB
Date 12/17/2014 10:15:57, Daylight Saving Time enabled
The Network Time Protocol is Enabled
Up 169 hours 28 minutes 13 seconds Since 10Dec2014:08:47:44
Total Device Resets: 1, Last Device Reset at: 11/29/2011 06:02:09
System in NAT/route mode.
FW02(M)-> get license
Model: Advanced
Sessions: 256064 sessions
Capacity: unlimited number of users
NSRP: ActiveActive
VPN tunnels: 2048 tunnels
Vsys: None
Vrouters: 16 virtual routers
Zones: 60 zones
VLANs: 150 vlans
Drp: Enable
Deep Inspection: Enable
Deep Inspection Database Expire Date: Disable
Signature pack: Signature update key is missing
IDP: Disable
AV: Disable(0)
Anti-Spam: Disable(0)
Url Filtering: Disable