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/dev/ptmx: device not found

Posted on 1999-01-12
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Last Modified: 2013-12-23
I have about 65 users logging into a SPARC20 server
(running Solaris 2.6).  These users are accessing the server
via Exceed on their PCs (telnet or rlogin sessions).  10 - 15
of these users get an error message that says "/dev/ptmx:
device not found" and are unable to log in.  What could be
the problem here?
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Question by:wpmorris
3 Comments
 
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Expert Comment

by:ahoffmann
ID: 1582892
Your system ranout of pseudo-ttys.
AFAIK, the number of pseudo-ttys is limited in the kernel.
I'm not shure if you simply kan create new pseudo-ttys just by createing new devices in /dev/pts.
see man ptm
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Expert Comment

by:dougwinter
ID: 1582893
man page for pts(7D) says:


The pseudo-tty subsystem simulates  a  terminal  connection,
where  the master side represents the terminal and the slave
represents the user process's special device end point.   In
order to use the pseudo-tty subsystem, a node for the master
side driver /dev/ptmx and N nodes for the slave driver (N is
determined  at  installation  time)  must  be installed. The
names of the slave devices are /dev/pts/M where  M  has  the
values 0 through N-1.

Anyone know what package you have to (re-)install to set this?


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Accepted Solution

by:
rfross earned 150 total points
ID: 1582894
add the following to /etc/system, where value is the new number
of ptys:

set pt_cnt=value      
set npty=same_value_as_pt_cnt
set sad_cnt=2_times_pt_cnt value
set nautopush=same_value_as_ pt_cnt

Then reboot/reconfigure with:

# reboot -- -r     OR

# touch /reconfigure; reboot   OR

# init 0
ok boot -r

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