Unstable IPSec Tunnels on 23 series

[tuaris]

Is it just me or is IPSEC not reliable on the 23 series?  I have multiple virtual appliances and can without doubt see a difference between 21 and 23.   If I have two 23.x appliances hooked up using site-site IPSEC, the tunnel is always breaking and I have to manually restart it.  If I have two 21.x appliance hooked up the tunnel is always working.  Mixing the two results in the tunnel breaking.  This problem started with 22.x becuase I also have a 22.x instance currently having the same problem, and I remember very well that's exactly when I first saw this issue.

[tuaris]

Quick update after writing the above post.  About 3 weeks ago I tried switching Key Exchange version to V1 on both ends (from default V2) on one of my tunnels on the 23.x systems.   After checking up on things, that tunnel now appears to be stable.  Going to try it on another pair and see if I can replicate the same result.