Error connecting to NX server

Question

When trying to connect to NX server with a NX CLient for Linux (installed from nxclient_3.5.0-7_amd64.deb) I get the following error.

NX> 203 NXSSH running with pid: 8009
NX> 285 Enabling check on switch command
NX> 285 Enabling skip of SSH config files
NX> 285 Setting the preferred NX options
NX> 200 Connected to address: nnn.nnn.nnn.nnn on port: 22
NX> 202 Authenticating user: nx
NX> 208 Using auth method: publickey
Received disconnect from nnn.nnn.nnn.nnn: 2: Too many authentication failures for nx

However when I am trying to use NX plugin for Remmina remote desktop client (from remmina-plugin-nx) I get the following different error:

NX> 536 ERROR: Reached the maximum number of allowed users on this server.

The Remmina diagnostic log states that it is NXSERVER - Version 3.5.0-11 - LFE. Is it a problem on my (client) side, or on server side?

Knowing as much as nothing about NX, have you tried to [Google](https://www.google.com/search?q=NX+536+ERROR) that error? — grassroot, Feb 13 '13 at 15:16

score 1 · Answer 1 · answered Feb 21 '13 at 22:12

It turns out that I have hit the limit of NX Free Edition of NoMachine NX Server. According to NoMachine NX - Products Page the free edition of NX server is limited to maximum 2 concurrent connections and maximum 2 users.

The NX Licensing article does not explain how those 2 users are calculated, and it is only implied that it is automatically two users which logged in / used NX server first.

The nomachine sessions (nxserver) thread on Ubuntu Forums says that server session info is stored at /usr/NX/var/db. After examining those files it turns out that name of logged user is stored in session-info files there.

$ sudo grep -hR userName /usr/NX/var/db/* | sort | uniq

shows exactly two userNames.

I don't know why official NX Client for Linux has shown

Too many authentication failures for nx

as error, and it took using NX plugin for Remmina to get

NX> 536 ERROR: Reached the maximum number of allowed users on this server.

Postscript:

I turned to using X2Go which doesn't have those limitations, is quite easy to install on Ubuntu (just add PPA), uses NX 3.x, though it is compatible only with itself.

Error connecting to NX server

1 Answers1

Postscript: