Tmux won’t run as non root user

tmux

If I run tmux as root, it runs normally and fully functional.
I created a couple users, and it will not run as any of the users.

create session failed: : No such file or directory

I checked the outside $TERM is xterm and inside $TERM is screen as FAQs suggest that is most common cause of problems.

I've used tmux regularly on many different systems, but I on this VPS I can't figure out what's up… A little help, please?

EDIT: Thanks to Jay's helpful advice about strace, I found a permissions problem with /dev/pty*. I fear this won't be a useful post for many others as it seems kind of a one-off problem. 

strace -f -e trace=file tmux

32000 open("/dev/ptmx", O_RDWR) = -1 EACCES (Permission denied)
32000 open("/dev/ptyp0", O_RDWR) = -1 EACCES (Permission denied)
.....
32000 open("/dev/ptypf", O_RDWR) = -1 EACCES (Permission denied)
32000 open("/dev/ptyq0", O_RDWR) = -1 ENOENT (No such file or directory)

Best Answer

A more general way to solve a problem of this nature:

strace -f -e trace=file tmux ..restofyourcommand...

Look for permission denied / no such file or directory errors right before it exits - might find a general reason behind why you're getting this error (that is, see what directory it was trying to create, then make it manually and observe the error, it might be that it's trying to make /home/x/some/dir without /home/x/some existing or something).

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