Login Problems with LON-CAPA

Which browsers can I use with LON-CAPA?

LON-CAPA is designed to work with the following browsers

Mozilla version 1.0 and higher
Netscape version 4.7 and higher
Internet Explorer version 5.0 and higher

on the following operating systems

Linux
UNIX
MacOS
Windows

If you have problems logging in with any browser or any operating system not listed above, please use another browser or computer.

I get "Username and/or password could not be authenticated"

The most common problem here is that the Caps-Lock button is pressed. Usernames and passwords are case sensitive, so it does matter if something is typed with lowercase or with uppercase letters.
The second most common problems is that users accidentally go to the wrong server. LON-CAPA is running at many universities, colleges, and schools. Especially if you hit upon this page by looking for "LON-CAPA" in Google or some other search engine, you might have hit a server at another place. Please make sure to use the URL provided to you.

I get "Login token missing, inaccessible or expired"

This is a very rare problem. If it occurs, please wait for 20 minutes, reload the login page, and try again. If after 20 minutes LON-CAPA still gives you the same message, please email the Server Administrator listed on the login page. The Server Administrator can verify your situation and re-enable logins.

After logging in, I get the message "Welcome," but then nothing happens

The most common problem is that your browser is not one of the browsers listed above.
If you have a supported browser, it might be hung. Please completely quit your browser, and start it again.
You might have installed a filter against so-called "pop-up ads" (those obnoxious windows that come up into your face trying to sell you something while you are surfing). These filters will prevent LON-CAPA from running properly. Please disable the filter for your school's domain, for example "xyzu.edu."
You might be getting your internet access from a free service provider which adds banner ads to your pages. These ads conflict with LON-CAPA, you will need to use another provider.
If all else fails, please try from another computer.

I hit "Log In," but nothing happens, or I get error messages and warnings

The most common problem is that your browser is not one of the browsers listed above.
You might have modified the preferences in your browser. In particular, the following preferences can be a problem:
- Scripting languages, in particular JavaScript, is disabled.
- The security settings are cranked up to a higher level. In particular, this might prevent unencrypted submission of passwords (LON-CAPA actually does its own encryption), or cross-server submission of forms.
If all else fails, please try from another computer.