# Error in TCP Connection **URL:** \ **Category:** IoT Modules\ **Tags:** faq\ **Created:** [February 26, 2025, 4:08pm UTC](https://forum.sierrawireless.com/t/error-in-tcp-connection/34545 "2025-02-26T16:08:40Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![mrinmoy](https://avatars.discourse-cdn.com/v4/letter/m/57b2e6/32.png) [@mrinmoy](https://forum.sierrawireless.com/u/mrinmoy)\ **Post date:** [February 26, 2025, 4:08pm UTC](https://forum.sierrawireless.com/t/error-in-tcp-connection/34545/1 "2025-02-26T16:08:40Z")
Hi, I am getting error while using CGDCONT=1,“IPV6” but works fine with CGDCONT=1,“IP” not able to understand the issue, kindly help [2025-02-26 20:59:53] AT+CGMM [2025-02-26 20:59:53] [2025-02-26 20:59:53] HL7692 [2025-02-26 20:59:53] [2025-02-26 20:59:53] OK [2025-02-26 20:59:53] AT+CGMI [2025-02-26 20:59:53] [2025-02-26 20:59:53] Sierra Wireless [2025-02-26 20:59:53] [2025-02-26 20:59:53] OK [2025-02-26 20:59:53] ATI3 [2025-02-26 20:59:53] [2025-02-26 20:59:53] RHL769x.2.27.183100.201809071813.x7120m\_3 [2025-02-26 20:59:53] [2025-02-26 20:59:54] +CGREG: 1 [2025-02-26 20:59:54] [2025-02-26 20:59:57] +SIM: 1 [2025-02-26 20:59:57] [2025-02-26 20:59:57] +KSUP: 0 [2025-02-26 20:59:57] [2025-02-26 21:00:04] +PBREADY [2025-02-26 21:00:04] AT+CGDCONT=1,“IP”,“[airtelgprs.com](http://airtelgprs.com)” [2025-02-26 21:00:11] [2025-02-26 21:00:11] OK [2025-02-26 21:00:11] AT+CFUN=1,1 [2025-02-26 21:00:23] [2025-02-26 21:00:23] OK [2025-02-26 21:00:23] [2025-02-26 21:00:23] +CGREG: 0 [2025-02-26 21:00:23] [2025-02-26 21:00:28] +CGREG: 2 [2025-02-26 21:00:28] [2025-02-26 21:00:28] +WDSI: 0 [2025-02-26 21:00:28] [2025-02-26 21:00:31] +CGREG: 1 [2025-02-26 21:00:31] [2025-02-26 21:00:34] +SIM: 1 [2025-02-26 21:00:34] [2025-02-26 21:00:34] +KSUP: 0 [2025-02-26 21:00:34] [2025-02-26 21:00:40] +PBREADY [2025-02-26 21:00:40] AT+KCNXCFG=1,“GPRS”,“[airtelgprs.com](http://airtelgprs.com)”,“”,“” [2025-02-26 21:00:44] [2025-02-26 21:00:44] OK [2025-02-26 21:00:44] AT+CGPADDR=1 [2025-02-26 21:00:56] [2025-02-26 21:00:56] +CGPADDR: 1,“100.71.128.80” [2025-02-26 21:00:56] [2025-02-26 21:00:56] OK [2025-02-26 21:00:56] AT+KCNXTIMER=1,30,3 [2025-02-26 21:01:03] [2025-02-26 21:01:03] OK [2025-02-26 21:01:03] AT+KCNXUP=1 [2025-02-26 21:01:09] [2025-02-26 21:01:09] OK [2025-02-26 21:01:09] [2025-02-26 21:01:09] +KCNX\_IND: 1,4,1 [2025-02-26 21:01:09] [2025-02-26 21:01:09] +KCNX\_IND: 1,1,0 [2025-02-26 21:01:09] AT+KTCPCFG=1,0,“[www.google.com](http://www.google.com)”,“80” [2025-02-26 21:01:20] [2025-02-26 21:01:20] +KTCPCFG: 1 [2025-02-26 21:01:20] [2025-02-26 21:01:20] OK [2025-02-26 21:01:20] AT+KTCPSTART=1 [2025-02-26 21:01:28] [2025-02-26 21:01:28] +KTCP\_IND: 1,1 [2025-02-26 21:01:28] [2025-02-26 21:01:28] CONNECT [2025-02-26 21:01:28] [2025-02-26 21:04:21] NO CARRIER [2025-02-26 21:04:21] [2025-02-26 21:04:21] +KTCP\_NOTIF: 1,4 [2025-02-26 21:04:21] AT+KCNXDOWN=1,1 [2025-02-26 21:10:51] [2025-02-26 21:10:51] OK [2025-02-26 21:10:51] [2025-02-26 21:10:51] +KCNX\_IND: 1,0,0 [2025-02-26 21:16:50] +SIM: 1 [2025-02-26 21:16:50] [2025-02-26 21:16:50] +KSUP: 0 [2025-02-26 21:16:50] [2025-02-26 21:16:52] +CGREG: 1 [2025-02-26 21:16:52] [2025-02-26 21:16:53] +PBREADY [2025-02-26 21:16:53] AT+CGDCONT=1,“IP”,“[airtelgprs.com](http://airtelgprs.com)” [2025-02-26 21:16:57] [2025-02-26 21:16:57] OK [2025-02-26 21:16:57] AT+CFUN=1,1 [2025-02-26 21:17:04] [2025-02-26 21:17:04] OK [2025-02-26 21:17:04] [2025-02-26 21:17:04] +CGREG: 0 [2025-02-26 21:17:04] [2025-02-26 21:17:09] +CGREG: 2 [2025-02-26 21:17:09] [2025-02-26 21:17:09] +WDSI: 0 [2025-02-26 21:17:09] [2025-02-26 21:17:12] +CGREG: 1 [2025-02-26 21:17:12] [2025-02-26 21:17:15] +SIM: 1 [2025-02-26 21:17:15] [2025-02-26 21:17:15] +KSUP: 0 [2025-02-26 21:17:15] [2025-02-26 21:17:21] +PBREADY [2025-02-26 21:17:21] AT+KCNXCFG=1,“GPRS”,“[airtelgprs.com](http://airtelgprs.com)”,“”,“” [2025-02-26 21:17:38] [2025-02-26 21:17:38] OK [2025-02-26 21:17:38] AT+CGPADDR=1 [2025-02-26 21:17:47] [2025-02-26 21:17:47] +CGPADDR: 1,“FE80:0:0:0:2:1:AAD5:2F99” [2025-02-26 21:17:47] [2025-02-26 21:17:47] OK [2025-02-26 21:17:47] AT+KCNXTIMER=1,30,3 [2025-02-26 21:18:04] [2025-02-26 21:18:04] OK [2025-02-26 21:18:04] AT+KCNXUP=1 [2025-02-26 21:18:12] [2025-02-26 21:18:12] OK [2025-02-26 21:18:12] [2025-02-26 21:18:12] +KCNX\_IND: 1,4,1 [2025-02-26 21:18:12] [2025-02-26 21:18:12] +KCNX\_IND: 1,2,1,3,30 [2025-02-26 21:18:12] AT+KTCPCFG=1,0,“[www.google.com](http://www.google.com)”,“80” [2025-02-26 21:18:23] [2025-02-26 21:18:23] +KTCPCFG: 1 [2025-02-26 21:18:23] [2025-02-26 21:18:23] OK [2025-02-26 21:18:23] AT+KTCPSTART=1 [2025-02-26 21:18:30] [2025-02-26 21:18:30] +KCNX\_IND: 1,4,1 [2025-02-26 21:18:30] [2025-02-26 21:18:30] +KCNX\_IND: 1,2,1,3,30 [2025-02-26 21:18:30] [2025-02-26 21:19:00] +KCNX\_IND: 1,4,2 [2025-02-26 21:19:00] [2025-02-26 21:19:00] +KCNX\_IND: 1,2,2,3,30 [2025-02-26 21:19:00] [2025-02-26 21:19:30] +KCNX\_IND: 1,4,3 [2025-02-26 21:19:30] [2025-02-26 21:19:30] +KCNX\_IND: 1,2,3,3,30 [2025-02-26 21:19:30] [2025-02-26 21:19:30] +KTCP\_NOTIF: 1,0 ---
**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:** [February 26, 2025, 4:35pm UTC](https://forum.sierrawireless.com/t/error-in-tcp-connection/34545/2 "2025-02-26T16:35:06Z")
I don’t quite see IPV6 is set: ```auto [2025-02-26 21:16:53] AT+CGDCONT=1,“IP”,“airtelgprs.com” [2025-02-26 21:16:57] [2025-02-26 21:16:57] OK [2025-02-26 21:16:57] AT+CFUN=1,1 [2025-02-26 21:17:04] [2025-02-26 21:17:04] OK [2025-02-26 21:17:04] [2025-02-26 21:17:04] +CGREG: 0 [2025-02-26 21:17:04] [2025-02-26 21:17:09] +CGREG: 2 [2025-02-26 21:17:09] [2025-02-26 21:17:09] +WDSI: 0 [2025-02-26 21:17:09] [2025-02-26 21:17:12] +CGREG: 1 [2025-02-26 21:17:12] [2025-02-26 21:17:15] +SIM: 1 [2025-02-26 21:17:15] [2025-02-26 21:17:15] +KSUP: 0 [2025-02-26 21:17:15] [2025-02-26 21:17:21] +PBREADY [2025-02-26 21:17:21] AT+KCNXCFG=1,“GPRS”,“airtelgprs.com”,“”,“” [2025-02-26 21:17:38] [2025-02-26 21:17:38] OK [2025-02-26 21:17:38] AT+CGPADDR=1 [2025-02-26 21:17:47] [2025-02-26 21:17:47] +CGPADDR: 1,“FE80:0:0:0:2:1:AAD5:2F99” ``` ---
**Author:** ![mrinmoy](https://avatars.discourse-cdn.com/v4/letter/m/57b2e6/32.png) [@mrinmoy](https://forum.sierrawireless.com/u/mrinmoy)\ **Post date:** [February 26, 2025, 4:41pm UTC](https://forum.sierrawireless.com/t/error-in-tcp-connection/34545/3 "2025-02-26T16:41:32Z")
@jyijyi I missed some lines while pasting, kindly check the below [2025-02-26 21:16:46] AT+CGMM [2025-02-26 21:16:46] [2025-02-26 21:16:46] HL7692 [2025-02-26 21:16:46] [2025-02-26 21:16:46] OK [2025-02-26 21:16:46] AT+CGMI [2025-02-26 21:16:46] [2025-02-26 21:16:46] Sierra Wireless [2025-02-26 21:16:46] [2025-02-26 21:16:46] OK [2025-02-26 21:16:46] ATI3 [2025-02-26 21:16:46] [2025-02-26 21:16:46] RHL769x.2.27.183100.201809071813.x7120m\_3 [2025-02-26 21:16:46] [2025-02-26 21:16:46] OK [2025-02-26 21:16:50] +SIM: 1 [2025-02-26 21:16:50] [2025-02-26 21:16:50] +KSUP: 0 [2025-02-26 21:16:50] [2025-02-26 21:16:52] +CGREG: 1 [2025-02-26 21:16:52] [2025-02-26 21:16:53] +PBREADY [2025-02-26 21:16:53] AT+CGDCONT=1,“IPV6”,“[airtelgprs.com](http://airtelgprs.com)” [2025-02-26 21:16:57] [2025-02-26 21:16:57] OK [2025-02-26 21:16:57] AT+CFUN=1,1 [2025-02-26 21:17:04] [2025-02-26 21:17:04] OK [2025-02-26 21:17:04] [2025-02-26 21:17:04] +CGREG: 0 [2025-02-26 21:17:04] [2025-02-26 21:17:09] +CGREG: 2 [2025-02-26 21:17:09] [2025-02-26 21:17:09] +WDSI: 0 [2025-02-26 21:17:09] [2025-02-26 21:17:12] +CGREG: 1 [2025-02-26 21:17:12] [2025-02-26 21:17:15] +SIM: 1 [2025-02-26 21:17:15] [2025-02-26 21:17:15] +KSUP: 0 [2025-02-26 21:17:15] [2025-02-26 21:17:21] +PBREADY [2025-02-26 21:17:21] AT+KCNXCFG=1,“GPRS”,“[airtelgprs.com](http://airtelgprs.com)”,“”,“” [2025-02-26 21:17:38] [2025-02-26 21:17:38] OK [2025-02-26 21:17:38] AT+CGPADDR=1 [2025-02-26 21:17:47] [2025-02-26 21:17:47] +CGPADDR: 1,“FE80:0:0:0:2:1:AAD5:2F99” [2025-02-26 21:17:47] [2025-02-26 21:17:47] OK [2025-02-26 21:17:47] AT+KCNXTIMER=1,30,3 [2025-02-26 21:18:04] [2025-02-26 21:18:04] OK [2025-02-26 21:18:04] AT+KCNXUP=1 [2025-02-26 21:18:12] [2025-02-26 21:18:12] OK [2025-02-26 21:18:12] [2025-02-26 21:18:12] +KCNX\_IND: 1,4,1 [2025-02-26 21:18:12] [2025-02-26 21:18:12] +KCNX\_IND: 1,2,1,3,30 [2025-02-26 21:18:12] AT+KTCPCFG=1,0,“[www.google.com](http://www.google.com)”,“80” [2025-02-26 21:18:23] [2025-02-26 21:18:23] +KTCPCFG: 1 [2025-02-26 21:18:23] [2025-02-26 21:18:23] OK [2025-02-26 21:18:23] AT+KTCPSTART=1 [2025-02-26 21:18:30] [2025-02-26 21:18:30] +KCNX\_IND: 1,4,1 [2025-02-26 21:18:30] [2025-02-26 21:18:30] +KCNX\_IND: 1,2,1,3,30 [2025-02-26 21:18:30] [2025-02-26 21:19:00] +KCNX\_IND: 1,4,2 [2025-02-26 21:19:00] [2025-02-26 21:19:00] +KCNX\_IND: 1,2,2,3,30 [2025-02-26 21:19:00] [2025-02-26 21:19:30] +KCNX\_IND: 1,4,3 [2025-02-26 21:19:30] [2025-02-26 21:19:30] +KCNX\_IND: 1,2,3,3,30 [2025-02-26 21:19:30] [2025-02-26 21:19:30] +KTCP\_NOTIF: 1,0 [2025-02-26 21:19:30] ---
**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:** [February 26, 2025, 4:42pm UTC](https://forum.sierrawireless.com/t/error-in-tcp-connection/34545/4 "2025-02-26T16:42:40Z")
how about you use the IPV6 address of google in AT+KTCPCFG? you might also specify IPv6 when using +KTCPCFG: ![image](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/5/5458405f18ce9cb99df807b0be3c71a56d9ebd63.png)