Connection has been gracefully closed

Hi

I have just installed tightvnc 2.8.85 on two Windows computers, one running
Windows 10 and the other Windows 11.

I have not problem using Server on the Windows 11 computer and Viewer on the
Windows 10 computer, but I can't get it to work the other way round.

If I try to use Viewer on the Windows 11 computer and select the target
computer I can enter a password but it immediately goes to a window saying "
Connection has been gracefully closed".

Here is the Viewer logfile from the Windows 11 computer:

[ 6192/ 2632] 2025-09-13 20:01:27 - Init WinSock 2.1
[ 6192/14172] 2025-09-13 20:01:30 - Protocol stage is "Connection
establishing".
[ 6192/14172] 2025-09-13 20:01:30 - Protocol stage is "Handshake".
[ 6192/14172] 2025-09-13 20:01:30 - Server sent protocol version: RFB
003.008
[ 6192/14172] 2025-09-13 20:01:30 - Send to server protocol version: RFB
003.008
[ 6192/14172] 2025-09-13 20:01:30 - Protocol stage is "Authentication".
[ 6192/14172] 2025-09-13 20:01:30 - Security type is selected: 2
[ 6192/14172] 2025-09-13 20:01:30 - Authentication type accepted: VNC (2)
[ 6192/14172] 2025-09-13 20:01:35 - onDisconnect: Connection has been
gracefully closed
[ 6192/ 2632] 2025-09-13 20:01:39 - Process focus restoration in the
RfbKeySym class
[ 6192/ 2632] 2025-09-13 20:01:39 - Process focus loss in the RfbKeySym
class
[ 6192/ 2632] 2025-09-13 20:01:39 - Process focus restoration in the
RfbKeySym class
[ 6192/ 2632] 2025-09-13 20:01:39 - Process focus loss in the RfbKeySym
class
[ 6192/ 2632] 2025-09-13 20:01:39 - Process focus restoration in the
RfbKeySym class
[ 6192/ 2632] 2025-09-13 20:01:39 - Process focus loss in the RfbKeySym
class
[ 6192/ 2632] 2025-09-13 20:01:39 - Process focus restoration in the
RfbKeySym class
[ 6192/ 2632] 2025-09-13 20:01:39 - Viewer collector: destroy all instances
[ 6192/ 2632] 2025-09-13 20:01:39 - Shutdown WinSock

Is the error with the Security type? How do I change this?

I'm not familiar enough with the protocol to understand this, so I'd be very
grateful if anyone could advise.




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