Sets the default authentication level for applications that do not call CoInitializeSecurity.
HKEY_LOCAL_MACHINE\Software\Microsoft\OLE\
LegacyAuthenticationLevel= default_authentication_level
LegacyAuthenticationLevel is a named-value is a REG_WORD that sets the default level of authentication for all applications which do not call CoInitializeSecurity. Values are from 1 through 6, and correspond to the RPC_C_AUTHN_LEVEL_xxx constants:
| Value | Meaning |
|---|---|
| 1 | RPC_C_AUTHN_LEVEL_NONE |
| 2 | RPC_C_AUTHN_LEVEL_CONNECT |
| 3 | RPC_C_AUTHN_LEVEL_CALL |
| 4 | RPC_C_AUTHN_LEVEL_PKT |
| 5 | RPC_C_AUTHN_LEVEL_PKT_INTEGRITY |
| 6 | RPC_C_AUTHN_LEVEL_PKT_PRIVACY |
When this named-value is not present, the default authentication level established by the system is 2 (RPC_C_AUTHN_CONNECT).
CoInitializeSecurity, RPC_C_AUTHN_LEVEL_xxx, Registering COM Servers