Here's a similar problem along these lines but a little different.  I can
open dt and X but when I do I can't open any more then 3 dt terminals I've
tried all the suggestions here dt -n 6 opens only 3 usuable terminals and
cmd-0 does absolutely nothing as for X if I open 3 xterms, 1 console, and 1
xclock using my .xinitrc it terminates X after loading the last xterm and
gives socket kill error messages on the 2nd and 3rd terminal.  If I only
open 2 xterms, 1 console, and 1 xclock its fine though.  Also whenever I
try to telnet into machine when either X or dt is running I get an error
"telnetd: all network ports are in use".  How do I fix this?


>I used MAKEDEV to create some more ptys, and now neither dt nor X will
>work!  dt clears the screen and exits without any error message; X starts,
>puts up the clock, then exits complaining that it can't get any ptys
>(actually, xterm etc. are complaining).
>
>I have plenty of ptys in /dev
>
>I tried opening ttyp0 through ttyp9 and they all returned file descriptors.
>
>I tried rebooting
>
>I tried ./MAKEDEV all from /dev
>
>The ttyp[0-f] entries look like:
>
>crw-rw-rw- 1 root wheel 5, [0-15] Apr 20 [time] /dev/ttyp[0-f]
>
>/etc/ttys has "none" and "network" for each entry
>
>What's wrong here?  I am loath to start randomly reinstalling stuff
>in order to solve this (I'd rather find out exactly what's wrong) -
>I was even reluctant to reboot <g>
>
>J.