Moving to another ISP

[pyraxic]

Our company is currently moving to another ISP and we are using pfsense for our firewall solution. We had setup OpenVPN for site-site VPN in the past and it's been working great. I backed up the current pfsense config at current ISP and restored it to another pfsense box at our new ISP. I would like to avoid downtime when we switch over to the new ISP. When I restored the config, I can't seem to use OpenVPN anymore under new ISP. I'm connected to WAN/LAN but VPN doesn't work. I'm using the same subnet for LAN.

I would really appreciate if someone could guide me if I'm missing anything.

Thanks

[cmb]

First things that come to mind:

1. you had the OpenVPN server or client bound to a virtual IP that needs to be changed to one of your new ISP's IPs.
2. your firewall rule permitting traffic to the OpenVPN server instance from the client instance now has the wrong source or destination IP (depending on whether the server or client side changed).
3. your client config needs to change server IPs to the new ISP, if the server side is the one that changed.

[pyraxic]

1. you had the OpenVPN server or client bound to a virtual IP that needs to be changed to one of your new ISP's IPs.
   How can I make changes to it?

2. your firewall rule permitting traffic to the OpenVPN server instance from the client instance now has the wrong source or destination IP (depending on whether the server or client side changed).
   We didn't specify the rule for outgoing connection so it's pretty much open. Source * to Destination *

3. your client config needs to change server IPs to the new ISP, if the server side is the one that changed.
   The source IP is changing, how can I change the server IP on the client side?