Long long time ago, I was running cu (a dial out program) and uucp on a
serial line on Solaris.  While the device was in use by one of these
programs the permissions were set to limit access by a single user. 
After disconnecting, it would set it back.  I wonder if something like
this is happening here.  Try fuser on the port and see if anyone has it
open?

Peter Clark wrote:
> 
> On Wednesday 10 July 2002 12:38, Peter Clark wrote:
>         Replying to myself here:
> >       I'm running Debian, so as far as I know there is no rouge program
> > resetting my security settings.
>         I found the rouge program, or at least narrowed it down to two: either kppp
> or ppp itself. I ran 'ls /dev/ttyS3' and saw that everything was good,
> connected using kppp, and suddenly it's been reset to crw-r-----.
> 
> >       Plus, I still don't know why the modem is stuck at 3.1k. When I first
> > dial-up, it's averaging between 5k and 6k, just like a 56k modem should,
> > but then after a while it goes down to 3.1k. I've tried two ISPs and I get
> > the same behavior, so it's a problem at my end.
>         The answers to both of these problems still elude me...
>         :Peter
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