# HL7692 PDP Authentification failure

**URL:** <https://forum.sierrawireless.com/t/hl7692-pdp-authentification-failure/20386>\
**Category:** IoT Modules\
**Created:** [May 19, 2020, 4:37pm UTC](https://forum.sierrawireless.com/t/hl7692-pdp-authentification-failure/20386 "2020-05-19T16:37:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![JFTWIT](https://avatars.discourse-cdn.com/v4/letter/j/d2c977/32.png) [@JFTWIT](https://forum.sierrawireless.com/u/JFTWIT)\
**Post date:** [May 19, 2020, 4:37pm UTC](https://forum.sierrawireless.com/t/hl7692-pdp-authentification-failure/20386/1 "2020-05-19T16:37:51Z")

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Hello,  
I use an APN with authentication is mandatory for a connection 4G.  
I make the following orders:

AT+CGATT=0 ==\> OK  
AT+CGDCONT=2,“IP”,“MyAPN” ==\> OK  
AT+WPPP=2,2,“logIn”,'psw" ==\> OK but i think it’s useless  
AT+CGATT=1 ==\> OK  
AT+CGACT=1,2 ==\> +CME ERROR: 149 (PDP Authentification failure)  
AT+CREG? ==\> +CREG: 0,5 OK  
AT+CSQ ==\> +CSQ: 16,99 OK  
AT+COPS? ==\> +COPS: 0,0,“F SFR”,0 OK

In your forum, i found:  
\*For HL7692, if the uname and pword are mandatory for the APN “o#####b.##”", you should not use AT+WPPP=1,1,"##UNAME##","##PWORD##", because +WPPP does not work for the external PPP dial up app (ATD _99_ \*_1#)._  
_Please input the uname and pword in the external PPP dial up app._

I prepared pppd (Linux) with authentication, but:  
ATD_99_\*\*2# ==\> **NO CARRIER**

if i use an APN without authentication, it works fine.

Version: RHL769x.2.27.183100.201809071813.x7120m\_3|

Thank you for your help

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<div class="post-metadata">

**Author:** ![Donald](https://avatars.discourse-cdn.com/v4/letter/d/ac8455/32.png) [@Donald](https://forum.sierrawireless.com/u/Donald)\
**Post date:** [May 21, 2020, 4:56am UTC](https://forum.sierrawireless.com/t/hl7692-pdp-authentification-failure/20386/2 "2020-05-21T04:56:18Z")

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Hi JFTWIT

Please make sure your SIM supports CHAP authentication from your mobile service provider.  
This issue has not been reproduced with the Amarisoft network simulator FW RHL769x.2.27 HL7692 at my side.

The log file is attached for your reference.[HL7692\_PDP Auth.txt](https://forum.sierrawireless.com/uploads/short-url/4rg5OJT46U1yyLaFQw3T77T1FQC.txt) (1005 Bytes)

Please help to mark “Solution” if your questions is answered.