The following table lists the authentication supported by P&M, and lists which protocols use these authentication methods over the Internet, an intranet, or an extranet.
| Authentication Methods | HTTP | LDAP | POP3 | NNTP |
|---|---|---|---|---|
| Automatic Cookie Authentication | X | N/A | N/A | N/A |
| *HTML Forms Authentication | X | N/A | N/A | N/A |
| Clear Text/Basic Authentication | X | X | X | X |
| *Distributed Password Authentication (DPA), used with Membership Authentication | X | X | X | X |
| Windows NT Challenge/Response (used with Windows NT Authentication) | X | X | X | X |
| Client Certificate Authentication (requires an SSL channel) | X | N/A | N/A | N/A |
*Only available in Membership Authentication mode.