Hello all,
I have installed my Linux Mandrake 7.2. All goes ok except but whenn I try to dial my isp. CHAP cannot authenticate.
My password is ok, and i don´t now what more can I do. Here is the log that I have captured.

pppd 2.4.0 started by root, uid 0
Using interface ppp0
Connect: ppp0 <--> /dev/ttyS1
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x2f8169e5> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0xe1 <auth chap MD5> <magic 0xe61664de> <mrru 1524> <endpoint 13...c>]
sent [LCP ConfRej id=0xe1 <mrru 1524>]
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x2f8169e5> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0xe2 <auth chap MD5> <magic 0xe61664de> <endpoint .........>]
sent [LCP ConfAck id=0xe2 <auth chap MD5> <magic 0xe61664de> <endpoint .........>]
rcvd [CHAP Challenge id=0xb1 <74...8>, name = "<deleted>"]
sent [CHAP Response id=0xb1 <e8...1>, name = "<deleted>"]
rcvd [CHAP Failure id=0xb1 "Authentication failure"]
Remote message: Authentication failure
CHAP authentication failed
sent [LCP TermReq id=0x2 "Failed to authenticate ourselves to peer"]
rcvd [LCP TermReq id=0xe3]
sent [LCP TermAck id=0xe3]
rcvd [LCP TermAck id=0x2]
Connection terminated.
Exit.

Thanks all.

PS: Excuse me for my english.

I'm not that good with all this modem stuff, but here is an overview of what it's trying to do.

Using interface ppp0
Connect: ppp0 <--> /dev/ttyS1
--------(Your system makes the link to the ISP)
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x2f8169e5> <pcomp> <accomp>]
--------(the ISP's server sends a challenge request to your Linux Box)
rcvd [LCP ConfReq id=0xe1 <auth chap MD5> <magic 0xe61664de> <mrru 1524> <endpoint 13...c>]
sent [LCP ConfRej id=0xe1 <mrru 1524>]
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x2f8169e5> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0xe2 <auth chap MD5> <magic 0xe61664de> <endpoint .........>]
sent [LCP ConfAck id=0xe2 <auth chap MD5> <magic 0xe61664de> <endpoint .........>]
--------(Your Box responds with a value obtained by using a one-way hash function using MD5)
rcvd [CHAP Challenge id=0xb1 <74...8>, name = "<deleted>"]
sent [CHAP Response id=0xb1 <e8...1>, name = "<deleted>"]
--------(The server checks the response by comparing it its own calculation of the expected hash value.)
--------(Failed)
rcvd [CHAP Failure id=0xb1 "Authentication failure"]
Remote message: Authentication failure
CHAP authentication failed
sent [LCP TermReq id=0x2 "Failed to authenticate ourselves to peer"]
--------(Terminating the handshake)
rcvd [LCP TermReq id=0xe3]
sent [LCP TermAck id=0xe3]
rcvd [LCP TermAck id=0x2]
Connection terminated.
Exit.

From the log I think it is going to be one of these points.
1) Your accounts deleted from the ISP (check you've paid)
2) They don't use CHAP-MD5 but MS-CHAP (Ask you ISP if they support Unix SVR4 systems)
3) You have some corruption going on with the MD5 hash algorithm.

/Raz

Thanks, razbot, but
> From the log I think it is going to be one of these points.
> 1) Your accounts deleted from the ISP (check you've paid)
I'm now connected from w2k.
> 2) They don't use CHAP-MD5 but MS-CHAP (Ask you ISP if they support Unix SVR4 systems)
The ISP packets say 'auth chap MD5' (?), or my linux interprets this as MD5
>3) You have some corruption going on with the MD5 hash algorithm.
I have unistall PPP and installed again but not go ok.
Can I reinstall the software that contains the MD5 hash algoritm?, where is it? in the kernel?

Thanks all