Connection failed from NoMachine Windows client to Linux on AWS

[georgeh]

I’m just testing NoMachine for the first time.
I want to be able to log into a headless AWS CentOS 7 Linux machine from Windows 10 client.

Server: NoMachine – Version 6.8.1  Free

Windows: NoMachine 6.8.1 Free
I installed both NoMachine and Gnome (Gnome Shell 3.28.3) on CentOS.
Started Gnome and NoMachine:

sudo startx
sudo /etc/NX/nxserver –restart

Port 4000 is open.
UDP ports 4651 and 4011-4999 are open.

Connecting from the Windows, NoMachine client fails.  I see the following.
Looks like maybe related to encryption.  I have installed the public key on the server and private key on the client.

18732 20336 15:36:17 796.368 ClientSession: Starting session at 0x037e8128.
18732 20336 15:36:17 796.368 ClientSession: Going to start session ‘C:\Users\george\OneDrive\Documents\NoMachine\Connection to ec2-18-207-244-105.compute-1.amazonaws.com.nxs’.
18732 20336 15:36:17 932.991 Connection: Finishing connection at 0x061ddc00.
18732 20336 15:36:17 932.991 ClientDaemonConnector: Stopping the current connection.
18732 20336 15:36:17 964.907 Connection: Finished connection at 0x061ddc00.
18732 20336 15:36:17 964.907 Connection: Initializing connection at 0x061ddc00.
18732 20336 15:36:17 999.785 Connection: Initialized connection at 0x061ddc00.
18732 20336 15:36:17 999.785 Connection: Starting connection at 0x061ddc00.
18732 20336 15:36:17 999.785 ClientDaemonConnector: Starting a new connection to host ‘ec2-18-207-244-105.compute-1.amazonaws.com’ on port ‘4000’.
18732 20336 15:36:18 000.794 Connection: Started connection at 0x061ddc00.
Info: Connection to 18.207.244.105 port 4000 started at 15:36:18 084.563.
18732 20336 15:36:18 085.562 ClientSession: Started session at 0x037e8128.
18732 1464 15:36:18 776.066 DaemonLogin/DaemonLogin: WARNING! Read from FD#3216 failed.
18732 1464 15:36:18 776.066 DaemonLogin/DaemonLogin: WARNING! Error 5, ‘Input/output error’.
18732 1464 15:36:18 777.058 Encryptor/Encryptor: ERROR! Encryption read from BIO pending 0 wpending 0 retry 8.
18732 1464 15:36:18 777.058 Encryptor/Encryptor: ERROR! Encryption read from BIO failed in context [B].
Error: Encryption read from BIO failed in context [B].
18732 1464 15:36:18 777.058 Encryptor/Encryptor: ERROR! Encryption read from BIO pending 0 wpending 0 retry 8.
18732 1464 15:36:18 777.058 Encryptor/Encryptor: ERROR! Encryption read from BIO failed in context [B].
Error: Encryption read from BIO failed in context [B].
18732 1464 15:36:18 777.058 Channel/Channel: WARNING! Runnable DaemonWriter failed for FD#3216.
18732 1464 15:36:18 777.058 Channel/Channel: WARNING! Error is 146, ‘Not a data message’.
18732 20336 15:36:18 777.058 Connection: WARNING! Ignoring the I/O error and waiting for the daemon error reporting.
18732 19900 15:36:18 778.055 DaemonClientApplication/DaemonClientApplication: WARNING! Session terminated abnormally.
18732 19900 15:36:18 778.055 DaemonClientApplication/DaemonClientApplication: WARNING! Error is 5, ‘Input/output error’.
Warning: Connection to 18.207.244.105 port 4000 failed at 15:36:18 778.055.
Warning: Error is 5, ‘Input/output error’.
18732 19900 15:36:18 778.055 Encryptor/Encryptor: WARNING! Destroying pending buffer with 11 bytes.
18732 20336 15:36:18 779.053 Connection: Connection at 0x061ddc00 failed.

[Britgirl]

Hi, to understand better what is happening, we need to see the server-side logs from the AWS CentOS machine.

Please follow the instructions here: https://www.nomachine.com/AR10K00697 and then send them to forum[at]nomachine[dot]com.

[Author]

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