Server Cuts Out

[gcooper at mhc.ab.ca (Grant Cooper)]

I am having a problem connecting to my server. If I reboot it will work
externally for about 50 minutes. After that I can't connect. So I thought my
server turned off. Or my connection was closed. I was able to ping out so I
connected remotely and I couldn't ping the server. I shut down and it worked
remotely again for 50 minutes. I am sure it is my ISP removing me from the
routing table somehow or my DHCP client is not refreshing but I'm not sure.
Does anyone have any ideas what I should do? I have tested a 2 freebsd
servers with no luck. I also used http header query tools. From home I can
get a connection but when I go to work and try it , it doesn't work after 50
minutes.

Thanks in advance.