All of a sudden Safari cannot connect to server when I go on certain websites. But when I tried these websites on the same computer from a different location they opened fine.

I used to go on several websites without a problem, one being www.udel.edu/udsis   but now all of a sudden when I try to open these websites it says "Safari can't connect to server". At first I thought my computer had the problem, but when I tried the other mac in my house I had the same issue. The next day I visited family in another state and brought my computer with me, I typed those website addresses in and they opened without a problem. But now I'm back at home and I still can't open those websites. What gives?

Leads one to suspect an ISP issue. Yours. Perhaps for the moment though. In any case I like to use OpenDNS servers for safety and speed.
System Preferences>Network>Advanced>DNS
In the left side column click on the + sign and insert the following:
208.67.222.222
208.67.220.220
Click OK, then click Apply.
Info on OpenDNS:
http://www.opendns.com/

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