Router – connection to vpn fails (sonicwall client through linksys router)

I'm trying to connect to my office using sonic client and consistently failing.
Actually sonicwall client informs me that connection to network is established, but when I tried to access one of the computers remotely using remote desktop it fails.

Here is a sonicwall log:

2009/09/24 12:54:58:109 Information <local host>    Renewing IP address for the virtual interface (00-60-73-ED-F9-E6).
2009/09/24 12:54:58:187 Warning     <local host>    Failed to renew the IP address for the virtual interface.
2009/09/24 12:55:03:359 Information <local host>    The IP address for the virtual interface has changed to 192.168.0.xxx.
2009/09/24 12:55:03:421 Information <local host>    The system ARP cache has been flushed.
2009/09/24 12:55:03:484 Information {ipaddress} NetWkstaUserGetInfo returned: user: user, logon domain: mymachine, logon server: mymachine
2009/09/24 12:55:05:750 Information {ipaddress}     NetGetDCName failed: Could not find domain controller for this domain.
2009/09/24 12:55:05:750 Information {ipaddress}     calling NetUserGetInfo: Server: \\mymachine, User: user, level: 3
2009/09/24 12:55:05:750 Information {ipaddress}     NetUserGetInfo returned: home dir: , remote dir: , logon script: 

I suspect that my router is not allowing connections, router I'm using is linksys WRT54G v8.2

Any help would be very much appreciated.