I'm not able to login with Internet Explorer and Microsoft IIS

If you are not able to login and always get the error "Username or password required" even if you have entered the right credentials, that means there is a problem with the session.

For example, this is a known issue if you meet these criteria:

  • You are using a domain name with an underscore: kanboard_something.mycompany.tld
  • You are using Microsoft Windows Server and IIS
  • Your browser is Internet Explorer

Solution: Do not use underscore in the domain name because this is not a valid domain name.

Explanation: Internet Explorer doesn't accept cookies with a domain name with underscores because it's not valid.

Reference: