Thank you, Carolyn.
I've exhausted those suggestions and many more found elsewhere as well as resetting everything on my network. No joy in Mudville.
Guess Apple won't be getting my money for Lion or any other software for a bit.
Could be a router problem or my cable modem, but since I can connect via Mac and PC via my wireless access point, the trouble would appear to be way above my paygrade and patience.
Since I have no found too many others with this issue, I'll just chalk it up to bad luck, my incompetence, or the waxing moon.
OK, found the answer!
The hosts file may also be blocking the iTunes Store.
- Open the Terminal utility located in Applications > Utilities.
- When Terminal opens, open the hosts file by typing entering the following command and pressing Enter:
sudo nano /private/etc/hosts
- Type your user password when prompted.
Note: This requires a non-blank admin password.
- Edit the hosts file:
The hosts file contains some comments (lines starting with the # symbol), as well as some default hostname mappings (e.g. 127.0.0.1 – localhost).
You can navigate the file using the arrow keys.
- If an entry is found containing apple.com, add # and a space to the beginning of that line.
Note: If this is a work system, the hosts file may be used to redirect to local resources, such as software updates. Consult your support resources.
- Save the hosts file.
- When done editing the hosts file, press Control-o to save the file.
- Press Enter on the filename prompt, and Control-x to exit the editor.
Followed these steps and now I'm able to access both the iTunes and the App stores.