> > Since no-one else has replied, I'll have a go. I've solved a similar
> > problem here by using a timer to make dummy queries of the db from the
> > clients every 5 minutes or so. My guess is that after our last network
> > upgrade, the new n/w equipment drops inactive connections after some
> > time (30 minutes?) to allow reuse of dynamically assigned IPs(?).
> >
> > HTH,
> > Steve

something else not making sense here is that dynamic IPs are leased for much
longer than 30 minutes. While you PC is on it will re-lease the same IP
continuously anyway, until it's turned off and the lease expires. Then when
it comes on again, it will lease another IP, it may the same one or it may
be different depending on how the DHCP server is setup to recycle IPs.
Alan