Typically these changes happen when you restart the WAN connected device (sonicwall in your case)Īs soon as that address changes the remote end of the VPN can no longer locate your Sonicwall to talk to it and establish the VPN connection because the address it is looking for is no longer correct. They probably don't change it often and it could even remain the same for years, but they can change it and eventually will change it. If you are on DHCP your address can be changed by your ISP. You state you don't know whey DHCP would affect the connection. If this happened, then you would have to let the other side of the VPN know to change their settings to account for the change in your WAN address. If you are using DHCP address rather than a static address, did your WAN address change?
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