getaddrinfo failed 51

[Bui Binh]

I used nrf9160 DK with sim LTE in Vietnam to run mqtt_sample. LTE link successful but I received the ERROR: getaddrinfo fail 51 and mqtt_connect 41. Please help me to solve it. Thanks for your help.

[Heidi]

Hi! Are you connecting over LTE-M or NB-IoT?

This file tells you the error message you're getting. 

#define EAFNOSUPPORT 47 /* Addr family not supported */

#define ENETUNREACH 51 /* Network is unreachable */

Could you please add the following config CONFIG_MQTT_LOG_LEVEL_DBG=y to the prj.conf file, and provide a full log file by pressing this button in LTE Link Monitor and attaching the .txt file.

Best regards,

Heidi

[Bui Binh]

Thank for your help, I did your tutorial but nothing change! Maybe I have to chek my SIM!!!

[ryan_g]

I am also seeing the same issue on a few nrf9160s that I have. Have you found a resolution?

Something to note was that these nrf9160s were working just fine not too long ago but suddenly stopped working.

I updated the modem firmware and re-flashed the mqtt_simple example and see a similar output (I also enabled some RTT logging to see what else was happening):

LTE Link Connecting ...
[00:10:00.935,882] <inf> lte_lc: Network connection attempt timed out
[00:10:00.942,382] <inf> lte_lc: Using fallback network mode
[00:20:00.974,029] <inf> lte_lc: Network connection attempt timed out
LTE Link Connected!
ERROR: getaddrinfo failed 51
ERROR: mqtt_connect -47