slingshot dialup not authenticating

[snd_me_stff]

I've just got a new slingshot dial-up but can't get authenticated. Details 
of the attempt are in the log attached.
Modem dials, does handshake, sends password/username but slingshot doesn't 
reply. I'm using PAP authentication which I'm pretty sure is correct.
pap-secrets exists with correct information in it.
I've googled for the problem and answers point to modem init strings.
I've also emailed slingshot but no reply from them. 

Dynalink 1456vqe-r1 external serial modem on Slackware-10 system.
I've run pppsetup and tried various combinations of settings, esp different 
init strings (ATZ, AT&F ...). I previously (few weeks ago) was connecting to 
paradise.et ok but I don't have access to that account anymore so I can't 
test it out.
I forgot to bring my pppscript and options files out to work today but if 
needed I can post them tomorrow. If anyone successfully connects to 
slingshot can I see your scripts? 

Any help would be great.
Cheers, Tim 

10:28  [EMAIL PROTECTED]:/etc/ppp# ppp-on
10:30  [EMAIL PROTECTED]:/etc/ppp# Jan 25 22:30:28 jessica pppd[1512]: pppd 2.4.2 
started by root, uid 0
Serial connection established.
using channel 3
Jan 25 22:30:53 jessica pppd[1512]: Serial connection established.
Using interface ppp0
Connect: ppp0 <--> /dev/modem
Jan 25 22:30:53 jessica pppd[1512]: Using interface ppp0
Jan 25 22:30:53 jessica pppd[1512]: Connect: ppp0 <--> /dev/modem
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x219368a7> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x1 <mru 1514> <asyncmap 0x0> <auth pap> <magic 
0x6f41b760> <pcomp> <accomp> <mrru 1514> <endpoint [null]>]sent [LCP ConfRej 
id=0x1 <mrru 1514>]
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x219368a7> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x2 <mru 1514> <asyncmap 0x0> <auth pap> <magic 
0x6f41b760> <pcomp> <accomp>]
sent [LCP ConfAck id=0x2 <mru 1514> <asyncmap 0x0> <auth pap> <magic 
0x6f41b760> <pcomp> <accomp>]
sent [PAP AuthReq id=0x1 user="username" password=<hidden>]
sent [PAP AuthReq id=0x2 user="username" password=<hidden>]
rcvd [PAP AuthNak id=0x0 52 65 71 75 65 73 74 20 44 65 6e 69 65 64]
sent [PAP AuthReq id=0x3 user="username" password=<hidden>]
sent [PAP AuthReq id=0x4 user="username" password=<hidden>]
sent [PAP AuthReq id=0x5 user="username" password=<hidden>]
sent [PAP AuthReq id=0x6 user="username" password=<hidden>]
sent [PAP AuthReq id=0x7 user="username" password=<hidden>]
sent [PAP AuthReq id=0x8 user="username" password=<hidden>]
sent [PAP AuthReq id=0x9 user="username" password=<hidden>]
sent [PAP AuthReq id=0xa user="username" password=<hidden>]
No response to PAP authenticate-requests
sent [LCP TermReq id=0x2 "Failed to authenticate ourselves to peer"]
Jan 25 22:31:24 jessica pppd[1512]: No response to PAP authenticate-requests
sent [LCP TermReq id=0x3 "Failed to authenticate ourselves to peer"]
Modem hangup
Connection terminated.
Jan 25 22:31:28 jessica pppd[1512]: Modem hangup
Jan 25 22:31:28 jessica pppd[1512]: Connection terminated.
Jan 25 22:31:29 jessica pppd[1512]: Exit.