Access to certain internet sites/services not working

A couple of days ago, my access to certain internet sites as well as my Mail programme and another email client app stopped making successful connections. I can open many web pages, but some do not work. Specifically, the local library where I can login to check the online catalogue doesn't work. My Mail app won't connect either. I also use another email app called First Class for work and it can't connect to the online server. If I start up Network Diagnostics and change from Airport or Built-in Ethernet it will work, at least until I quit the app and reboot it, then it can't make the connection. I have checked and replaced cables, removed the Airport and gone direct with Built-in Ethernet, etc. This phenomenon happens with all five user accounts on the computer. Other computers in our home which are connect to the LAN have no such behaviours happening, which leads me to conclude something is not right on the iMac we use all the time.
Any ideas?

Hi Dennis, and welcome to the Discussions!
My guess at this point is that you should drag these files to the Desktop for possible later replacement should it not work, then reboot & setup Networking/Internet again...
/Library/Preferences/SystemConfiguration/preferences.plist
/Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist

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