I have a site to site VPN set up between a Meraki firewall and a TMG server.
All of the settings match: site to site subnets, IPsec settings, Gateway IPs, ect..
After random periods of time, the site to site VPN on the TMG side will "sleep" or go "idle"
both sides are set to authenticate and re generate new keys after 8 hours.
the second I try to ping a computer on my local site from the remote site, the VPN is back up! it doesn't make sense.
Please help, I know this is probably something easy I am missing