[CentOS] Curious behaviour of openvpn

I noticed that when I went over to CentOS-5.4
on my server (and re-booted),
my openvpn connections failed for a couple of hours,
and then came back.

Has anyone noticed this?

What puzzled me was that the tun0 interface
was present on all machines (according to ifconfig)
but the connections seemed to be lost.

-- 
Timothy Murphy  
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland