telnetd error in Exceed

[Marjorie A. Rudinsky]

Dear All,
Getting the following telnetd message when I try to open a second telnet window in Exceed to the same system:

Trying...
Connected to [hostnameX].
Escape character is '^]'.
telnetd: open /dev/ptmx: No such device
.
Local flow control off
Connection closed by foreign host.

Yesterday, I could open a few telnet sessions to this hostname, but today, I can only open one telnet session.

[Jeff Schussele · Accepted solution]

Hi Marjorie,

If a session can be opened from nowhere it's possible the system has encountered the npty maximum (default 60)
If so only recourse is to close unneeded/unused sessions to free up connections OR increase the npty kernel parameter.

Rgds,
Jeff

[Bill Hassell]

Note that for 10.20, nstrpty should be set to the same value as npty so that the newer streams-based LAN code will have enough pseudo-terminal device files. And at 11.xx, you'll want to make a larger number of telnet device files for streams-based telnet service. The parameter is nstrtel, so you might as well make:

nstrtel=nstrpty=npty