External Authentication returning "Access Denied"

[Hooch180]

Hello.
I'm hosing Windows 7 virtual machine on Windows 8.1 host.

I'm trying to setup extern auth for connecting to Windows 7 machine.
Authenticton set to null is working good. I can connect. When trying to connect with auth set to external I'm getting error.

Error in attachment.
And this is in log:

Code: Select all

00:00:16.114126 VRDP: Connection opened (IPv4): 3
00:00:16.114192 VRDP: Negotiating security method with the client.
00:00:16.158692 VRDP: Methods 0x0000001b
00:00:16.158706 VRDP: Channel: [rdpdr] [1004]. Accepted.
00:00:16.158709 VRDP: Channel: [rdpsnd] [1005]. Accepted.
00:00:16.158712 VRDP: Channel: [cliprdr] [1006]. Accepted.
00:00:16.158715 VRDP: Channel: [drdynvc] [1007]. Accepted.
00:00:16.158717 VRDP: Unsupported SEC_TAG: 0xC006/8. Skipping.
00:00:16.158720 VRDP: Unsupported SEC_TAG: 0xC00A/8. Skipping.
00:00:16.279865 VRDP: Client seems to be MSFT.
00:00:16.279878 VRDP: Logon: M-KUSNIERZ-NEW (192.168.0.12) build 9600. User: [Maciej] Domain: [] Screen: 0
00:00:16.279964 AUTH: User: [Maciej]. Domain: []. Authentication type: [External]
00:00:16.280594 AUTH: external authentication module returned 'access denied'
00:00:16.280599 AUTH: Access denied.
00:00:16.280603 VRDP: Connection closed: 3

I unchecked box "Always ask for credentials".

How to fix it?