>>12 hrs? exactly? I would check for leases of DHCP (if any) ....
>
>After several days of ontime period, it has started to do that again. It did twice so far again every 12 hours. I checked the Client Lease Time. It is 0. This means one day. However, it that would be one day, it would means that it would cut off every 24 hours not 12. The maximum value is also 9999 which means about 7 days. This doesn't make any sense. There must be a way to have this connection to be set up permanently. Do you have any other recommendations?

hi,
Yes you are right. 0 means 24hrs. But when 50% of the lease time expires i.e. 12hrs

Check out

DHCP Lease Renewal

After 50% of the lease time has passed, the client will attempt to renew the lease with the original DHCP server that it obtained the lease from using a DHCPREQUEST message. Any time the client boots and the lease is 50% or more passed, the client will attempt to renew the lease. At 87.5% of the lease completion, the client will attempt to contact any DHCP server for a new lease. If the lease expires, the client will send a request as in the initial boot when the client had no IP address. If this fails, the client TCP/IP stack will cease functioning.


at
http://www.comptechdoc.org/independent/networking/guide/netdhcp.html

So it is lease not renewing or Erroring out ?

thanx
suhashegde