At the risk of showing my ignorance once again, I'll pass this along:
I was unable to connect via Telnet to Wikipedia using my Apple II
through its serial connection (getty) to the Mac OS X Unix Terminal.
So, I tried it again on the Mac without the involvement of the Apple II.
Again I failed.
After determining that neither my ISP nor my firewall was blocking Port
23 from working, it hit me.
My mistake:
I entered:
telnet
wmflabs.org 23
Whereas, I *should have* entered:
telnet
telnet.wmflabs.org 23
Details, details.
BTW, thanks for the tip!