Take the 2-minute tour ×
Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems.. It's 100% free, no registration required.

I got an embedded system trying to create a ppp connection using a GSM modem. However the connection is never established and all I get is this error message in syslog:

Oct 12 08:38:48 pppd[451]: pppd 2.4.4 started by root, uid 0
Oct 12 08:38:59 pppd[451]: Connect script failed
Oct 12 08:39:00 pppd[451]: Exit.

I now need some hints how to proceed finding the cause of this problem. Where should I start looking?

share|improve this question
add comment

2 Answers

up vote 4 down vote accepted

Somewhere in your ppp setup (probably either in /etc/ppp/options or at the command line), you have an option called connect followed by a command used to setup the modem for a connection. It's usually a chat script. You need to find out why that command is failing. If it is a chat script, you can make it verbose by changing it from chat blah blah... to chat -v blah blah.

Also for convenience, I like to add either the updetach or nodetach option to ppp so I don't have to keep checking the log.

share|improve this answer
    
Great! I will try it out. –  ihatetoregister Oct 14 '11 at 13:49
    
Found the problem! The bit rate setting of the modem and the port were not the same. –  ihatetoregister Oct 18 '11 at 11:08
    
@ihatetoregister Interesting; I know at least one of the modem drivers specifically discards the bit rate, and I've tried setting various bit rates on many modems an not found it to affect anything. Would you mind sharing which modem this was? –  Shawn J. Goff Oct 18 '11 at 11:19
add comment

Add the debug parameter, then you are able to see errors in logfile. If the error happens near authentication, then you probably use wrong authentication methods (most common case); if it happens near compression then you have forced something that isn't allowed by server.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.