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Sonicwall Global VPN Client behind Firewall

Have Dlink DSL modem with firewall at my current site. I cannot connect to company VPN at that site even with valid user and password. Is there a port that needs to be opened on firewall?
2 Solutions
IpSec use's UDP port 500, and 4500,  many routers will have a option for VPN pass through, what model of router do you have?
Are you connecting to the public IP address of the VPN server ? Check is the firewall has IPSEC pass through feature. If yes enable it.  If not the following ports IP port 50 and 51 , UDP port 500 should be opened up on the firewall
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