GVC is not connecting to VPN (NSA-240 full bundle).

While attempting to connect asking for PRE-Shared Key then its shows "authenticating" thats it.
this is the log from GVC for this:

2009/04/07 11:58:56:108 Information 80.90.37.135 Starting ISAKMP phase 1 negotiation.
2009/04/07 11:58:56:389 Information 80.90.37.135 Starting aggressive mode phase 1 exchange.
2009/04/07 11:58:56:389 Information 80.90.37.135 NAT Detected: Local host is behind a NAT device.
2009/04/07 11:58:56:389 Information 80.90.37.135 NAT Detected: Peer is behind a NAT device.
2009/04/07 11:58:56:389 Information 80.90.37.135 The SA lifetime for phase 1 is 28800 seconds.
2009/04/07 11:58:56:389 Information 80.90.37.135 Phase 1 has completed.
But it was worked last week perfectly. We have not made any changes since.

When I Disabled "NAT Traversal" on Sonicwall,the GVC started to ask authentication and I entered username and password then it says provisioning and just stuck "aquiring IP Adress". Thats it..... But not connecting to VPN Server (NSA 240)
This is the log from GVC for this:

2009/04/07 12:02:22:561 Information <local host> The connection "prduae.dynip.com" has been enabled.
2009/04/07 12:02:31:000 Information 80.90.37.135 Starting ISAKMP phase 1 negotiation.
2009/04/07 12:02:31:214 Information 80.90.37.135 Starting aggressive mode phase 1 exchange.
2009/04/07 12:02:31:214 Information 80.90.37.135 The SA lifetime for phase 1 is 28800 seconds.
2009/04/07 12:02:31:215 Information 80.90.37.135 Phase 1 has completed.
2009/04/07 12:02:31:283 Information 80.90.37.135 Received XAuth request.
2009/04/07 12:02:31:283 Information 80.90.37.135 XAuth has requested a username but one has not yet been specified.
2009/04/07 12:02:31:284 Information 80.90.37.135 Sending phase 1 delete.
2009/04/07 12:02:31:284 Information 80.90.37.135 User authentication information is needed to complete the connection.
2009/04/07 12:02:31:420 Information <local host> An incoming ISAKMP packet from 86.98.37.135 was ignored.
2009/04/07 12:02:40:221 Information 80.90.37.135 Starting ISAKMP phase 1 negotiation.
2009/04/07 12:02:40:836 Information 80.90.37.135 Starting aggressive mode phase 1 exchange.
2009/04/07 12:02:40:836 Information 80.90.37.135 The SA lifetime for phase 1 is 28800 seconds.
2009/04/07 12:02:40:837 Information 80.90.37.135 Phase 1 has completed.
2009/04/07 12:02:40:866 Information 80.90.37.135 Received XAuth request.
2009/04/07 12:02:40:866 Information 80.90.37.135 Sending XAuth reply.
2009/04/07 12:02:40:872 Information 80.90.37.135 Received initial contact notify.
2009/04/07 12:02:40:873 Information 80.90.37.135 Received XAuth status.
2009/04/07 12:02:40:873 Information 80.90.37.135 Sending XAuth acknowledgement.
2009/04/07 12:02:40:873 Information 80.90.37.135 User authentication has succeeded.
2009/04/07 12:02:41:119 Information 80.90.37.135 Received request for policy version.
2009/04/07 12:02:41:119 Information 80.90.37.135 Sending policy version reply.
2009/04/07 12:02:41:128 Information 80.90.37.135 Received policy update.
2009/04/07 12:02:41:128 Information 80.90.37.135 Sending policy acknowledgement.
2009/04/07 12:02:41:128 Information 80.90.37.135 The configuration for the connection has been updated.
2009/04/07 12:02:41:630 Information 80.90.37.135 Sending phase 1 delete.
2009/04/07 12:02:42:579 Information <local host> Saving configuration file C:\Users\shabab.PRDDXBLC\AppData\Roaming\SonicWALL\SonicWALL Global VPN Client\SonicWALL Global VPN Client.rcf.
2009/04/07 12:02:42:592 Information <local host> The configuration file 'C:\Users\shabab.PRDDXBLC\AppData\Roaming\SonicWALL\SonicWALL Global VPN Client\SonicWALL Global VPN Client.rcf' has been saved.
2009/04/07 12:02:51:075 Information 80.90.37.135 Starting ISAKMP phase 1 negotiation.
2009/04/07 12:02:51:252 Information 80.90.37.135 Starting aggressive mode phase 1 exchange.
2009/04/07 12:02:51:252 Information 80.90.37.135 The SA lifetime for phase 1 is 28800 seconds.
2009/04/07 12:02:51:252 Information 80.90.37.135 Phase 1 has completed.
2009/04/07 12:02:51:302 Information 80.90.37.135 Received XAuth request.
2009/04/07 12:02:51:302 Information 80.90.37.135 XAuth has requested a username but one has not yet been specified.
2009/04/07 12:02:51:302 Information 80.90.37.135 Sending phase 1 delete.
2009/04/07 12:02:51:303 Information 80.90.37.135 User authentication information is needed to complete the connection.
2009/04/07 12:02:51:341 Information <local host> An incoming ISAKMP packet from 86.98.37.135 was ignored.
2009/04/07 12:02:55:104 Information 80.90.37.135 Starting ISAKMP phase 1 negotiation.
2009/04/07 12:02:55:156 Information 80.90.37.135 Starting aggressive mode phase 1 exchange.
2009/04/07 12:02:55:156 Information 80.90.37.135 The SA lifetime for phase 1 is 28800 seconds.
2009/04/07 12:02:55:157 Information 80.90.37.135 Phase 1 has completed.
2009/04/07 12:02:55:186 Information 80.90.37.135 Received XAuth request.
2009/04/07 12:02:55:189 Information 80.90.37.135 Sending XAuth reply.
2009/04/07 12:02:55:194 Information 80.90.37.135 Received initial contact notify.
2009/04/07 12:02:55:195 Information 80.90.37.135 Received XAuth status.
2009/04/07 12:02:55:195 Information 80.90.37.135 Sending XAuth acknowledgement.
2009/04/07 12:02:55:195 Information 80.90.37.135 User authentication has succeeded.
2009/04/07 12:02:55:225 Information 80.90.37.135 Received request for policy version.
2009/04/07 12:02:55:225 Information 80.90.37.135 Sending policy version reply.
2009/04/07 12:02:55:233 Information 80.90.37.135 Received policy change is not required.
2009/04/07 12:02:55:233 Information 80.90.37.135 Sending policy acknowledgement.
2009/04/07 12:02:55:234 Information 80.90.37.135 The configuration for the connection is up to date.
2009/04/07 12:02:55:283 Information 80.90.37.135 Starting ISAKMP phase 2 negotiation with 192.168.100.0/255.255.255.0:BOOTPC:BOOTPS:UDP.
2009/04/07 12:02:55:284 Information 80.90.37.135 Starting quick mode phase 2 exchange.
2009/04/07 12:02:55:343 Information 80.90.37.135 The SA lifetime for phase 2 is 28800 seconds.
2009/04/07 12:02:55:344 Information 80.90.37.135 Phase 2 with 192.168.100.0/255.255.255.0:BOOTPC:BOOTPS:UDP has completed.
2009/04/07 12:02:55:908 Information <local host> Renewing IP address for the virtual interface (00-60-73-EF-E4-91).
2009/04/07 12:03:55:010 Warning <local host> Failed to renew the IP address for the virtual interface.
My Scenario...
WAN port Connected to Linksys Router.
LAN port Connected to switch.
DHCP Server is Sonicwall for Local Client and VPN Cleint


I tried to troubleshoot like:
1) Re installed GVC several times on client machines(all are Vista machines).
2) Updated firmware- "sw_nsa- 240__eng_5.2.0.1".
3) Linksys port forwarding enabled 1 -65535 on both (TCP & UDP).

I really appreciate prompt reply from any sonic wall experts

Thanks,

MS