IS_Transport login context contains default login modules such as X509LoginModule, BasicLoginModule, SamlOSGiLoginModule.

Each login module first checks whether it has the required credentials. If the module finds the credentials, it uses them. If the module does not find the credentials, it returns a value of "false."

For example, the BasicLoginModule attempts to get the user name and password. If it cannot locate either, it returns a value of "false," which causes this module to fail. The modules listed within IS_Transport contain the "requisite" designation. That designation means that for the overall login to succeed, one of the modules in the login context must succeed.