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FreeNX wierdness

I've set up a few of these servers now, but I've found a problem (which is a known problem). The packages for the freeNX server under Redhat are 1.5, whereas those under Ubuntu/Debian are 1.4, this is fine except that you can connect to the 1.5 server from the new 2.x client, but not the 1.4 server. The 1.5.0 client can be used to connect to both. You can tell if you have a problem, because the client will successfully authenticate, but will fail at the end:

NX> 203 NXSSH running with pid: 4844
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: 192.168.0.119 on port: 22
NX> 202 Authenticating user: nx
NX> 208 Using auth method: publickey
HELLO NXSERVER - Version 1.4.0-45-SVN OS (GPL)
NX> 105 hello NXCLIENT - Version 1.4.0
NX> 134 Accepted protocol: 1.4.0
NX> 105 SET SHELL_MODE SHELL
NX> 105 SET AUTH_MODE PASSWORD
NX> 105 login
NX> 101 User: paul
NX> 102 Password:
NX> 103 Welcome to: paul-ubuntu user: paul
NX> 105 listsession --user="paul" --status="suspended,running" --geometry="1400x1050x24+render" --type="unix-gnome"
NX> 127 Sessions list of user 'paul' for reconnect:
Display Type Session ID Options Depth Screen Status Session Name
------- ---------------- -------------------------------- -------- ----- -------------- ----------- ------------------------------
NX> 148 Server capacity: not reached for user: paul
NX> 105 startsession --link="adsl" --backingstore="1" --nodelay="1" --encryption="1" --cache="8M" --images="32M" --media="0" --session="Home-Home" --type="unix-gnome" --cookie="******" --geometry="1024x768+188+114" --kbtype="pc105/us" --screeninfo="1024x768x24+render"

NX> 1000 NXNODE - Version 1.4.0-45-SVN OS (GPL) NX> 700 Session id: paul-ubuntu-1000-531E6551EE8E5BF9B58B669E364DAA11 NX> 705 Session display: 1000 NX> 703 Session type: unix-gnome NX> 701 Proxy cookie: acfe24b70625000bd409026837739796 NX> 702 Proxy IP: 127.0.0.1 NX> 706 Agent cookie: 426dea9932211fbafb099051a861b9c6 NX> 704 Session cache: unix-gnome NX> 707 SSL tunneling: 1 NX> 105 /usr/lib/nx/nxserver: line 891: 8408 Terminated ( sleep $AGENT_STARTUP_TIMEOUT; exit 1 ) NX> 504 Session startup failed. NX> 1004 Error: nxagent failed to start with: Unrecognized option: 1 NX> 1001 Bye. Killed by signal 15.