Error connecting to NX server

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?