I have a VPN tunnel configured between two sites. It shows "IPsec SA Established"
However, I am unable to ping any resources from local to remote, or visa versa.
The logs show "Failed 1 of 3 times to get DPD R-U-THERE-ACK from peer "xxx.xxx.xxx.xxx"
It's been working all along, until I added a firewall "allow" rule for a network printer, it unexpectedly stopped working.
I hard rebooted both routers, and still no joy.
I just disabled the new rule, did a soft reboot and the channel is back up!
I am confused, the rule is straight forward (attached), and cannot see how that can break the channel?