We have an SBS 2008 server that keeps losing connection to the internet approx 2-3 times a day. It's a simple setup, BT Business Broadband ADSL to a Wireless Zyxel router to the server. Clients connect via WiFi from their laptops. Plugging ethernet in makes no difference, only a reboot of the router seems to bring everything back again.
I'm looking at the forwarders on the DNS properties page and they're timing out when trying to resolve the IPs. Currently there are two IPs in there, 18.104.22.168 which has timed out and 22.214.171.124 which has finally resolved to ns8.bt.net
We've been in there and replaced all media, installed a PCI NIC, have changed the router three times. There are no errors in the DNS event logs pertaining to what's going on.
We've also been on to BT who are adamant that it's not their end.
Could someone shed some light on what could be going on or where else to look in the configuration of the server?