If using old bnc network cards replace the 50 ohm also check cat5 cables. I have an e1000 as well single high with slow data exchange. All else fails replace network card. When we setup class F network servers we had a fail safe server to take over if server fails. do you have access to a main internet router that routes the traffic if that was reset by you or your isp it might take 15-30min to send the packets out. i ran a whois on the servers no return went to another site ran whois gave me ns infomation. Check Power Options in advanced mode check power and sleep timers. just did a traceroute on server dsl ip.att.net request time out found you main route kc1 level 3 sent up north where our main internet routers was setup. If it's not on your end talk with your isp att trace route time out.
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