Computer Science 351: Questions and Answers

Frequently asked questions about lab assignments, homeworks, lectures, or any other topic of CS 351 will be posted here.

If you have a question you'd like answered send email to compsci-351@uwm.edu


AFS and Kerberos problems

Q: When I try to get a token, it says "Authentication server not available."

A: Assuming you have network connectivity and all outgoing ports are open, the most likely cause of the problem is that you aren't using the "Network Identity Manager" to get your tokens. You need to download Kerberos for Windows.

Q: lpr says ``permission denied'' when I try to print files!

A: This is because you don't have a PAG (Google "AFS PAG" to get more info).. Workarounds include:

Q: I changed my kerberos password using Window's Leash Tool (or Network Identity Manager) and now I can't get 'klog' to work with either the new or old password. Help!

A: The problem is that Leash/NIM uses an encoding technique for your new password that the backward compatibility hack of 'klog' can't handle. The easy way to fix the problem is to log onto weise and use

/usr/afsws/bin/kpasswd.uwmcs ePantherID
This command handles all encodings but changes the password to use the old encoding. So if you type the new password three times, then 'klog' will work again.


CS 351 FAQ / John Tang Boyland boyland@cs.uwm.edu