Problem login via RDP to server 2008 R2

Hi,

I've just installed brand new Server 2008 R2 for my customer. I connected it to my local LAN, delivered IP via DHCP, and I tried to login from inside LAN to it via RDP.

I am connecting from Server 2008 R2 to another Server 2008 R2, using RDP...but it fails!
I get prompt for username and password, and it is immidiatelly refused. If i look onto TARGET server, which I am trying to connect to, I find every attempt logged in Security log like you see in <CODE> window.
I also try to connect vice versa, from NEW to OLD Server 2008R2, and it is successful!
So:

RDP from OLD ---> NEW  =  Failure
RDP from NEW ---> OLD  = Sucess

Both are Server 2008 R2,
both on the same LAN, no firewall inbetween.
Firewalls on both are opened for RDP.

Any idea?

Log Name:      Security
Source:        Microsoft-Windows-Security-Auditing
Date:          23.12.2009 17:02:58
Event ID:      4625
Task Category: Logon
Level:         Information
Keywords:      Audit Failure
User:          N/A
Computer:      WEBSERVER
Description:
An account failed to log on.

Subject:
	Security ID:		NULL SID
	Account Name:		-
	Account Domain:		-
	Logon ID:		0x0

Logon Type:			3

Account For Which Logon Failed:
	Security ID:		NULL SID
	Account Name:		Administrator
	Account Domain:		VIPER5

Failure Information:
	Failure Reason:		Unknown user name or bad password.
	Status:			0xc000006d
	Sub Status:		0xc000006a

Process Information:
	Caller Process ID:	0x0
	Caller Process Name:	-

Network Information:
	Workstation Name:	VIPER5
	Source Network Address:	-
	Source Port:		-

Detailed Authentication Information:
	Logon Process:		NtLmSsp 
	Authentication Package:	NTLM
	Transited Services:	-
	Package Name (NTLM only):	-
	Key Length:		0

This event is generated when a logon request fails. It is generated on the computer where access was attempted.

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