# HL7802 - KHTTP\_ERROR: 1,5 over GSM **URL:** \ **Category:** HL78\ **Created:** [October 6, 2025, 10:44am UTC](https://forum.sierrawireless.com/t/hl7802-khttp-error-1-5-over-gsm/35552 "2025-10-06T10:44:31Z")\ **Posts on this page:** 15\ **Page:** 1
**Author:** ![damdam](https://avatars.discourse-cdn.com/v4/letter/d/9dc877/32.png) [@damdam](https://forum.sierrawireless.com/u/damdam)\ **Post date:** [October 6, 2025, 10:44am UTC](https://forum.sierrawireless.com/t/hl7802-khttp-error-1-5-over-gsm/35552/1 "2025-10-06T10:44:31Z")
Hello, I’m facing a problem using modem HL7802 with firmware 4.6.9.4. I use only HTTP connection. The connection to the serveur works fine when the modem is connected in CAT-M1 but when I’m in GSM (2G) I have the error: “HTTP connection error due to internal trouble” ```auto Log MCU to HL7802 (10:11:06.946) AT+KCNXTIMER=1,30,2,60,0 (10:11:12.351) AT+KHTTPCFG=1,"my_serveur.com",80 ``` ```auto Log HL7802 (2025-10-06 10:11:12.366) +KHTTPCFG: 1 (2025-10-06 10:11:16.027) OK (2025-10-06 10:11:16.027) +KCNX_IND: 1,4,1 (2025-10-06 10:11:16.027) +KCNX_IND: 1,2,1,2,30 (2025-10-06 10:11:46.023) +KCNX_IND: 1,4,2 (2025-10-06 10:11:47.621) +KCNX_IND: 1,2,2,2,30 (2025-10-06 10:11:47.621) +KHTTP_ERROR: 1,5 ``` How can I do to avoid this problem ? Any help is appreciated 🙂 ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [October 6, 2025, 10:55am UTC](https://forum.sierrawireless.com/t/hl7802-khttp-error-1-5-over-gsm/35552/2 "2025-10-06T10:55:04Z")
How about tcp and udp? I remember it should work in gsm mode > [@How to detect if NTP server cannot be reached](https://forum.sierrawireless.com/t/how-to-detect-if-ntp-server-cannot-be-reached/33879/10): > > I have just made a test with my HL7802 with GSM network here. I found that the CCLK time is updated after starting some UDP communication: ati3 HL7802.4.6.9.4 OK at+cpin? +CPIN: READY OK at+ksrat? +KSRAT: 0 OK at+ksrat=2 OK at+cfun=1,1 OK at+cpin? +CPIN: READY OK at+cgdcont? +CGDCONT: 1,"IPV4V6",,,0,0,0,0,0,,0,,,,, +CGDCONT: 2,"IPV4V6",,,0,0,0,0,0,,0,,,,, OK at+cgdcont=1,"IP","hkcsl" OK at+cgpaddr=1 +CGPADDR: 1 OK at+creg? +CREG: 0,1 OK at+cclk? +CCLK: "24/10/24,14:27:42+32" OK at+c… ---
**Author:** ![damdam](https://avatars.discourse-cdn.com/v4/letter/d/9dc877/32.png) [@damdam](https://forum.sierrawireless.com/u/damdam)\ **Post date:** [October 6, 2025, 2:16pm UTC](https://forum.sierrawireless.com/t/hl7802-khttp-error-1-5-over-gsm/35552/3 "2025-10-06T14:16:12Z")
Hi, Thanks for feddback. I try another thing but I got an error: ```auto (14:52:35.331) at+ksrat? (14:52:35.378) at+ksrat? (14:52:35.378) +KSRAT: 2 (14:52:35.378) OK (14:52:42.974) at+cfun=1,1 (14:52:43.025) at+cfun=1,1 (14:52:46.798) OK (14:52:55.927) at+cgdcont? (14:52:55.977) at+cgdcont? (14:53:04.337) +CGDCONT: 1,"IP",,,0,0,0,0,0,,0,,,,, (14:53:04.337) +CGDCONT: 2,"IPV4V6",,,0,0,0,0,0,,0,,,,, (14:53:04.337) OK (14:53:15.542) at+cgdcont=1,"IP","hkcsl" (14:53:15.671) at+cgdcont=1,"IP","hkcsl" (14:53:15.671) OK (14:53:17.655) at+cgdcont=1,"IP","hkcsl" (14:53:17.750) at+cgdcont=1,"IP","hkcsl" (14:53:17.750) OK (14:53:27.966) at+cgpaddr=1 (14:53:28.074) at+cgpaddr=1 (14:53:28.074) +CGPADDR: 1 (14:53:28.074) OK (14:53:38.250) at+creg? (14:53:38.350) at+creg? (14:53:38.350) +CREG: 0,5 (14:53:38.350) OK (14:53:50.712) at+cclk? (14:53:50.823) at+cclk? (14:53:50.823) +CCLK: "25/10/06,14:53:46+08" (14:53:50.823) OK (14:54:00.139) at+cgdcont? (14:54:00.245) at+cgdcont? (14:54:00.245) +CGDCONT: 1,"IP","hkcsl",,0,0,,0,,,,,,,, (14:54:00.245) +CGDCONT: 2,"IPV4V6",,,0,0,0,0,0,,0,,,,, (14:54:00.245) OK (14:54:33.255) AT+KHTTPCFG=1,"google.com",80 (14:54:33.383) AT+KHTTPCFG=1,"google.com",80 (14:54:33.383) +KHTTPCFG: 1 (14:54:34.778) OK (14:54:34.778) +KCNX_IND: 1,4,1 (14:54:34.778) +KCNX_IND: 1,2,1,2,30 (14:55:04.781) +KCNX_IND: 1,4,2 (14:55:06.300) +KCNX_IND: 1,2,2,2,30 (14:55:06.300) +KHTTP_ERROR: 1,5 ``` Is something missing to do especially if I’m in GSM ? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [October 6, 2025, 2:17pm UTC](https://forum.sierrawireless.com/t/hl7802-khttp-error-1-5-over-gsm/35552/4 "2025-10-06T14:17:51Z")
I think you use the wrong apn for +cgdcont Btw, how about trying tcp and udp? ---
**Author:** ![damdam](https://avatars.discourse-cdn.com/v4/letter/d/9dc877/32.png) [@damdam](https://forum.sierrawireless.com/u/damdam)\ **Post date:** [October 6, 2025, 3:42pm UTC](https://forum.sierrawireless.com/t/hl7802-khttp-error-1-5-over-gsm/35552/5 "2025-10-06T15:42:59Z")
Hi, Since I have put AT+KCNXCFG=1,“GPRS”,“good APN” it’s now working. Now, even if I power OFF then power ON the board, it’s still working (without entering command KCNXCFG) In the AT command I can see this (my developement started with module fw version 4.3.9): ![image](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/c/c504f05d2e7c3ee264e32a7f0ccbe26f723f198c.png) The modem shall works even if the command is not entred. Btw, I now have to find a way to know precisely how to fix it. To try to reset the modul I have dowloaded the firmware 4.3.9.0 and it’s still working. How can I do to restart the module from scratch ? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [October 6, 2025, 4:16pm UTC](https://forum.sierrawireless.com/t/hl7802-khttp-error-1-5-over-gsm/35552/6 "2025-10-06T16:16:35Z")
Isn’t that the root cause is wrong APN is entered? ---
**Author:** ![damdam](https://avatars.discourse-cdn.com/v4/letter/d/9dc877/32.png) [@damdam](https://forum.sierrawireless.com/u/damdam)\ **Post date:** [October 7, 2025, 7:34am UTC](https://forum.sierrawireless.com/t/hl7802-khttp-error-1-5-over-gsm/35552/7 "2025-10-07T07:34:33Z")
Hi, Before yesterday, I never put any APN in the modem and it worked fine with CAT-M1 and NB-IOT. So it should works with GSM too ? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [October 7, 2025, 7:38am UTC](https://forum.sierrawireless.com/t/hl7802-khttp-error-1-5-over-gsm/35552/8 "2025-10-07T07:38:16Z")
You can make a test to verify in gsm mode ---
**Author:** ![damdam](https://avatars.discourse-cdn.com/v4/letter/d/9dc877/32.png) [@damdam](https://forum.sierrawireless.com/u/damdam)\ **Post date:** [October 7, 2025, 8:12am UTC](https://forum.sierrawireless.com/t/hl7802-khttp-error-1-5-over-gsm/35552/9 "2025-10-07T08:12:36Z")
Hi, Thanks for feedback, I really appreciate your reactivity ! I have another modem and I try to connect in 2G and CAT-M1: 2G: ![image](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/b/b7769a8c573989477f7dbc330df0e7e5190e9831.png) CAT-M1: ![image](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/b/befd36128018fd682b9086d0e1fb0577fc61c12f.png) Here I didn’t put anything on APN. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [October 7, 2025, 8:35am UTC](https://forum.sierrawireless.com/t/hl7802-khttp-error-1-5-over-gsm/35552/10 "2025-10-07T08:35:10Z")
why don’t you put the correct APN in the module? I remember GSM mode is a bit different from LTE mode. Even without APN, it can still register circuit switch network for GSM mode. For for LTE mode, user needs to enter correct when register network. ---
**Author:** ![damdam](https://avatars.discourse-cdn.com/v4/letter/d/9dc877/32.png) [@damdam](https://forum.sierrawireless.com/u/damdam)\ **Post date:** [October 7, 2025, 8:53am UTC](https://forum.sierrawireless.com/t/hl7802-khttp-error-1-5-over-gsm/35552/11 "2025-10-07T08:53:29Z")
The product is not delivred with SIM card so I don’t know what will be the APN. I try AT command to read it from SIM card without success, any idea about how to get the APN ? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [October 7, 2025, 9:03am UTC](https://forum.sierrawireless.com/t/hl7802-khttp-error-1-5-over-gsm/35552/12 "2025-10-07T09:03:44Z")
of course the user needs to enter the APN by themselves Or you can check this list: > ---
**Author:** ![damdam](https://avatars.discourse-cdn.com/v4/letter/d/9dc877/32.png) [@damdam](https://forum.sierrawireless.com/u/damdam)\ **Post date:** [October 7, 2025, 9:52am UTC](https://forum.sierrawireless.com/t/hl7802-khttp-error-1-5-over-gsm/35552/13 "2025-10-07T09:52:14Z")
Hi, Thanks for the list but I can’t use it because user hadn’t keyboard to enter the APN (note: my apn 1NCE used for tests is not present in the list) There is a specific AT command to read it from SIM card ? Why need we to enter the APN for 2G connection ? It’s not needed for CAT-M1 and NB-IOT. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [October 7, 2025, 10:45am UTC](https://forum.sierrawireless.com/t/hl7802-khttp-error-1-5-over-gsm/35552/14 "2025-10-07T10:45:29Z")
> [@damdam](#): > > Why need we to enter the APN for 2G connection ? It’s not needed for CAT-M1 and NB-IOT. Gsm network is different from lte network … You might need to update and embed the apn list in your host application ---
**Author:** ![damdam](https://avatars.discourse-cdn.com/v4/letter/d/9dc877/32.png) [@damdam](https://forum.sierrawireless.com/u/damdam)\ **Post date:** [October 7, 2025, 12:06pm UTC](https://forum.sierrawireless.com/t/hl7802-khttp-error-1-5-over-gsm/35552/15 "2025-10-07T12:06:00Z")
Hi, Thanks for all. I will find a solution to manage 2G connection. Have a nice day.