# Data connect fails due to missing DNS **URL:** \ **Category:** Legato Application Framework\ **Created:** [September 18, 2019, 2:38pm UTC](https://forum.legato.io/t/data-connect-fails-due-to-missing-dns/4720 "2019-09-18T14:38:10Z")\ **Posts on this page:** 15\ **Page:** 1
**Author:** ![Maroua](https://avatars.discourse-cdn.com/v4/letter/m/839c29/32.png) [@Maroua](https://forum.legato.io/u/Maroua)\ **Post date:** [September 18, 2019, 2:38pm UTC](https://forum.legato.io/t/data-connect-fails-due-to-missing-dns/4720/1 "2019-09-18T14:38:10Z")
Hello, I have a WP7700 red and I’m Following the getting started tutorial. I reached the point where I’m supposed to run redSensorToCloud in order to connect to the Cloud. However, this didn’t seem to work so I tried “cm data connect” and I figured out that the device didn’t connect because of the missing DNS I checked again and Indeed in the info the two DNS fields are empty(N/A). So I am sure that the sim card I have doesn’t offer DNS. Any idea how can I proceed ? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [September 18, 2019, 2:54pm UTC](https://forum.legato.io/t/data-connect-fails-due-to-missing-dns/4720/2 "2019-09-18T14:54:51Z")
How about editng the /etc/resolv.conf file? > **[Setup DNS Resolution With "resolv.conf" in Examples - ShellHacks](https://www.shellhacks.com/setup-dns-resolution-resolvconf-example/)** > > The /etc/resolv.conf configuration file contains information that allows a computer to convert alpha-numeric domain names into the numeric IP addresses. The process of converting domain names to IP addresses is called resolving. When using DHCP,... ---
**Author:** ![Maroua](https://avatars.discourse-cdn.com/v4/letter/m/839c29/32.png) [@Maroua](https://forum.legato.io/u/Maroua)\ **Post date:** [September 18, 2019, 3:55pm UTC](https://forum.legato.io/t/data-connect-fails-due-to-missing-dns/4720/3 "2019-09-18T15:55:31Z")
Actually I Don’t seem to find this file Under etc… ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [September 19, 2019, 3:14am UTC](https://forum.legato.io/t/data-connect-fails-due-to-missing-dns/4720/4 "2019-09-19T03:14:22Z")
I can see it in WP76 module. root@swi-mdm9x28:~# cat /etc/resolv.conf nameserver 10.145.148.1 nameserver 10.144.148.133 root@swi-mdm9x28:~# root@swi-mdm9x28:~# cm data Index: 1 APN: hkcsl PDP Type: IPV4V6 Connected: no root@swi-mdm9x28:~# root@swi-mdm9x28:~# cm info Device: WP7608 IMEI: 352913090100734 IMEISV: 4 FSN: XG805285330204 Firmware Version: SWI9X07Y\_02.16.02.00 000000 jenkins 2018/04/19 19:59:02 Bootloader Version: SWI9X07Y\_02.16.02.00 000000 jenkins 2018/04/19 19:59:02 [511.647542] i2c-msm-v2 78b8000.i2c: NACK: slave not responding, ensure its powered: msgs(n:1 cur:0 tx) bc(rx:0 tx:2) mode:FIFO slv\_addr:0x3a MSTR\_STS:0x081343c8 OPER:0x00000090 MCU Version: 002.009 PRI Part Number (PN): 9907762 PRI Revision: 001.001 Carrier PRI Name: GENERIC Carrier PRI Revision: 002.032\_000 SKU: 1103788 Last Reset Cause: Power Down Resets Count: Expected: 526 Unexpected: 9 ---
**Author:** ![JordanZhao](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jordanzhao/32/789_2.png) [@JordanZhao](https://forum.legato.io/u/JordanZhao)\ **Post date:** [September 19, 2019, 9:34am UTC](https://forum.legato.io/t/data-connect-fails-due-to-missing-dns/4720/5 "2019-09-19T09:34:20Z")
How about “touch /etc/resolv.conf” and restart cm data connect? ---
**Author:** ![raf](https://avatars.discourse-cdn.com/v4/letter/r/848f3c/32.png) [@raf](https://forum.legato.io/u/raf)\ **Post date:** [September 20, 2019, 5:17am UTC](https://forum.legato.io/t/data-connect-fails-due-to-missing-dns/4720/6 "2019-09-20T05:17:41Z")
As you’ve suggested @JordanZhao. We do that during our production testing, else the modems can’t establish a data connection. ---
**Author:** ![fdu](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/fdu/32/811_2.png) [@fdu](https://forum.legato.io/u/fdu)\ **Post date:** [September 23, 2019, 11:08am UTC](https://forum.legato.io/t/data-connect-fails-due-to-missing-dns/4720/7 "2019-09-23T11:08:33Z")
Hi which bearer are you using ? Can you give the response of the following AT commands ? AT!SELACQ? AT!SELCIOT? ---
**Author:** ![Maroua](https://avatars.discourse-cdn.com/v4/letter/m/839c29/32.png) [@Maroua](https://forum.legato.io/u/Maroua)\ **Post date:** [September 23, 2019, 11:55am UTC](https://forum.legato.io/t/data-connect-fails-due-to-missing-dns/4720/8 "2019-09-23T11:55:21Z")
Hello so when I created the file I put the google dns (8.8.8.8 and 8.8.8.4) within. When I run cm data connect it says that it is connected but I Don’t see anything on the airvantage. Is there a way to see the traffic at the level of the device ? @fdu here is what I get for these commands: AT!SELACQ? !SELACQ: LTE LTE-M1 LTE-NB1 GSM OK And the second command : AT!SELCIOT? current operating mode : 0x06 supported operated modes: LTE WB: 0x01 LTE M1: 0x02 LTE NB1: 0x04 OK ---
**Author:** ![fdu](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/fdu/32/811_2.png) [@fdu](https://forum.legato.io/u/fdu)\ **Post date:** [September 23, 2019, 12:07pm UTC](https://forum.legato.io/t/data-connect-fails-due-to-missing-dns/4720/9 "2019-09-23T12:07:45Z")
Sorry @Maroua I forgot these 2 commands: AT+CREG=2 AT+CREG? The aim is to know the current activated beader: LTE-M1 or LTE-NB1 Thanks ---
**Author:** ![Maroua](https://avatars.discourse-cdn.com/v4/letter/m/839c29/32.png) [@Maroua](https://forum.legato.io/u/Maroua)\ **Post date:** [September 23, 2019, 12:10pm UTC](https://forum.legato.io/t/data-connect-fails-due-to-missing-dns/4720/10 "2019-09-23T12:10:59Z")
Thank you for your quick comment @fdu I obtained: +CREG: 2,3 ---
**Author:** ![fdu](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/fdu/32/811_2.png) [@fdu](https://forum.legato.io/u/fdu)\ **Post date:** [September 23, 2019, 12:27pm UTC](https://forum.legato.io/t/data-connect-fails-due-to-missing-dns/4720/11 "2019-09-23T12:27:36Z")
Mhh your device seems to be rejected by the network. Can you check your APN setting in +CGDCONT command ? ---
**Author:** ![Maroua](https://avatars.discourse-cdn.com/v4/letter/m/839c29/32.png) [@Maroua](https://forum.legato.io/u/Maroua)\ **Post date:** [September 23, 2019, 12:34pm UTC](https://forum.legato.io/t/data-connect-fails-due-to-missing-dns/4720/12 "2019-09-23T12:34:58Z")
So the Following pdp context is the Following: +CGDCONT: 1,“IP”,“APN”,“0.0.0.0”,0,0,0,0 and the APN is correctly set. What would make the device rejected by the network ? ---
**Author:** ![fdu](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/fdu/32/811_2.png) [@fdu](https://forum.legato.io/u/fdu)\ **Post date:** [September 23, 2019, 12:46pm UTC](https://forum.legato.io/t/data-connect-fails-due-to-missing-dns/4720/13 "2019-09-23T12:46:34Z")
Are you sure that APN is the APN related to your SIM card ? Can you send me the response to “AT+CIMI” command please ? ---
**Author:** ![Maroua](https://avatars.discourse-cdn.com/v4/letter/m/839c29/32.png) [@Maroua](https://forum.legato.io/u/Maroua)\ **Post date:** [September 23, 2019, 12:59pm UTC](https://forum.legato.io/t/data-connect-fails-due-to-missing-dns/4720/14 "2019-09-23T12:59:24Z")
yes I’m sure about the APN. As for the command it successfully returns the IMSI. ---
**Author:** ![plu](https://avatars.discourse-cdn.com/v4/letter/p/e19b73/32.png) [@plu](https://forum.legato.io/u/plu)\ **Post date:** [October 3, 2019, 9:07am UTC](https://forum.legato.io/t/data-connect-fails-due-to-missing-dns/4720/15 "2019-10-03T09:07:31Z")
hi @Maroua, as indicated by fdu, your device is rejected by the network. usually it means there is a mismatch between the APN allowed by the network and SIM and the one set into the device ( ie at+cgdcont) can you double check the following: at!gstatus? at+cops=? at+cgdcont? cm SIM info cm radio info cm data info in order to check every settings . Best Regards,