Mac Mini connected to internet, but claims not to be.

Everything was working correctly when I went to sleep last night; this morning, Safari claimed that my computer wasn't connected to the internet. iTunes and Rosetta Stone both agree with Safari and refuse to do anything on the internet.
I was unable to determine any setup problems with ping, dig, or curl, and Firefox is able to access the internet without any problems. I am using a wired Ethernet connection, and the AirPort is turned off. The Ethernet cable is plugged into a switch, which is in turn connected to my DSL modem.
The IP address, netmask, gateway, and DNS server are entered manually and I have verified that they are correct. Network settings lists the Ethernet connection as "Connected". I have changed no settings since it was last working, and no one else has access to the computer or networking equipment.

I posted in this forum looking for an expert's insight into the root cause of my problem. Had I just wanted the problem to go away immediately, I would have tried rebooting the computer (and possibly the networking equipment) before I posted. There are a few reasons why I didn't:
1) There are several other computers and devices connected to the internet through the same networking equipment. They do not have any problem talking to the internet. The Mac Mini can also talk to the internet through this networking equipment; it is only some applications that are having trouble. None of this points towards problems with the networking gear.
2) Some of the other computers that are connected to the internet through this equipment are running services that I do not wish to disrupt by breaking their connection to the internet.
3) I am trying to diagnose and fix this problem, and rebooting the Mac will likely destroy any evidence of what is actually going on.
4) Computer problems are almost never isolated incidents. While rebooting everything may make the problem go away for now, it still won't actually be fixed, and may reoccur at a significantly more inopportune time.
So, to answer your question: No, I haven't tried rebooting everything and bringing it back up in a particular order. I would like to apologize for not including an actual question in my original post, which may have caused some misunderstanding as to what I was hoping to find. What do you believe could be the root cause of this issue, and what further steps could I take to help identify it?

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http://support.apple.com/kb/HT2712
old... http://docs.info.apple.com/article.html?artnum=106653
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Mac Mini connected to internet, but claims not to be.

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