Telnet fails: set_id: not applicable (SCO)

Upon trying to connect the host with telnet or rlogin (even from the same host)we get it ask the login and password, write the welcome message and then terminate connection with the following error:
telnetd: set_id() failed: Operation not applicable.

What can be the cause of this problem?
Telnet worked yesterday but we have made many changes to the system since.
LVL 2
costyaAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

johns_philipCommented:
Make sure the permission of telnet, rlogin and su in /usr/bin directory
These should be in following permission

 telnet   -r-xr-xr-x
 rlogin    -r-sr-xr-x
 su         -r-sr-xr-x

0
battlejCommented:
also make sure login if setuid root!!!
0
djveCommented:
As implied above: check the permissions on telnet
and fix them. If this has happened and you can't
track it down also check for system compromise.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Unix OS

From novice to tech pro — start learning today.