Thanks for taking the time to try and help. However, the majorityof my problem isn't with the length of the password (I was just pointing out how it's length was complicating matters even more). The problem lies in the fact that the passphrase given by the WiFi (not selected by me) apparently has multiple characters that can be interpreted differently. Of couse a shorter password would allow for less cance of ambiguity, but that's a seperate issue. Unfortunately, I was not responsible for selecting the length or character choice of the passphase and as far as I know I have no way to change it.
I have used these Recommended Wireless Router Settings, I use channel 11, for many years. I have not had a wireless devices that would not connect to my wireless network.
I use my own special password, that is 13 characters long and I know what the password is. I do NOT use a word out of the dictionary, but a combimation of a word or two combined with numbers included, which makes trying to hack into my network very hard to do.
I leave my network on 24/7 and have not had anyone try to connect. I do monitor the network, so I can tell which children are online, including my printer, in case someone turns it off, they're not supposed to turn this off. If my network goes down, I get notified immediately on the laptop I'm using.
What's your operating system? It might be simpler to configure the wireless right in the OS, rather than using that Sony (or Intel, but I think Sony) utility.
Here's a set of instructions for Windows 7, and Vista should be quite similar. http://www.kombitz.com/2009/02/09/windows-7-how-to-create-an-ad-hoc-network/. If you use these instructions, in Step 5 you will be able to enter any passphrase you want. When you do this, consider that there's at least a small risk that someone nearby could connect to your PC, so at the least don't make the passphrase the name of your favorite team or the word "password."
I'm not familiar with the Squeezbox interface, so I'm not sure how you get the key into that device, but at least if you configure it yourself, you'll know what key to use.
For wireless passwords, I go to https://www.grc.com/passwords.htm and copy out a whole one or the part that I want, then paste it into the interface. Then I paste it into a document so I have it for next time.
I have experienced this problem before myself, and it is very frustrating.
The only possible ambiguities I can see are the three characters that could be lower case L's, Upper case I's, or numeric 1's. I doubt the possibility of them being ones, so that probably just leaves the first two options. Take a look in Character Map and see if you can match the font, that can be a help in identifying subtle differences between letters and numerals. If you find a match for the font, increasing the font size can also show up slight difference in line thickness or character width.
By 'manually entered' do you mean that you must type them rather than copy and paste from a text file? Retyping is a bummer.
If copy and paste is an option, I type out the password in full in notepad, copy it however many times are necessary to include the possible variations, which is usually not more than 9, make those changes sequentially, then copy and paste each option in turn, adding a X to the end of every version that fails (don't immediately delete, it saves retyping again if you think of a new variation), and a Y to the end of the successful version if I hit the jackpot (the Y is removed after the others are deleted.
It sure saves you the hell of retyping that many characters for each attempt.