I have downgraded a few systems without problems using the same method 
for the same reason(ipsec works under 1.2 but connections fail after 
some amount of time on 1.21 and 1.22).

Kimmo Jaskari wrote:
> My VPN is acting up and I can't find anything wrong. It worked fine
> with 1.20, so I'm thinking downgrade for now.
> 
> I'm running with a CD/floppy version - can I just plonk in the 1.20 CD
> in my firewall and reboot it? That is, can you downgrade that easily
> or will I have to do a basic setup anew and then read in the backup
> xml file?
> 
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