Site-to-Site VPN after 2.6 upgrade stop working
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Want to confirm we're seeing the exact same thing here - we've got a bunch of 2.4.x in production we just upgraded to 2.6.0, with quite a few tunnels going between them, and it's been running flawlessly for 2 years now. All are running virtually, and on the other side we've got a mix of netgate 2100s recently upgraded to 23.01.
The issue only happens between some 2.6.0s - we'd see things hang with both sides trying to initiate. In the logs: "ignoring acquire, connection attempt pending". We used nearly half a day debugging this, and the only way to get things to come up reliably (and so far, stay up), was to roll back one side to 2.4.4. Tunnels suddenly came up.