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Modem port Device Busy Error

 
David Land
Frequent Advisor

Modem port Device Busy Error

I have PPP configured on my HP-UX 11.23 server and it has run well. Friday afternoon I received a message in my pppd.log file saying "Call failed (Can't open 'cul3b8' Device Busy". I have had this issue before and I believe some process had it open. I have tried fuser to verify whether a user had this device file. No luck. I then tried ps to verify whether a process was still open, no luck again. I even changed the permissions on this device file to rw-rw-rw. Again no luck. I just continue to receive this message every time I try to dial out.

Does anyone have some suggestions as to what I can do to fix this, without having to re-boot my server?
5 REPLIES
Bill Hassell
Honored Contributor

Re: Modem port Device Busy Error

fuser is only about 50% accurate in showing processes that have a file open. You need to download lsof and use that to find the culprit.


Bill Hassell, sysadmin
Yogesh M Puranik
Valued Contributor

Re: Modem port Device Busy Error

Hi,


lsof is the best command to get list of open files under perticular file system.

If you have that then you can run,
ex.
#lsof /tmp

If you dont have then install the depot.

Hope this will help you out.


Rgds
Yogesh
David Land
Frequent Advisor

Re: Modem port Device Busy Error

Do you know where I can download lsof? I have tried to find some links on ITRC and am unsuccessful at finding one that works.
Steven Schweda
Honored Contributor

Re: Modem port Device Busy Error

> Do you know where I can download lsof?

Where did you look?

A Google search for
lsof
should be able to find the source kit.

A Forum search for, say,
lsof depot
should be able to find a depot.
James R. Ferguson
Acclaimed Contributor

Re: Modem port Device Busy Error

Hi David:

Fetch an 'lsof' binary for HP-UX from the HP-UX Porting Centre:

http://hpux.connect.org.uk/hppd/hpux/Sysadmin/lsof-4.82/

Regards!

...JRF...