# RC7620-1 - Cannot open TCPCNX after CGATT=0 **URL:** \ **Category:** RC76\ **Created:** [October 22, 2021, 1:38pm UTC](https://forum.sierrawireless.com/t/rc7620-1-cannot-open-tcpcnx-after-cgatt-0/25288 "2021-10-22T13:38:19Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![mt\_0x](https://avatars.discourse-cdn.com/v4/letter/m/278dde/32.png) [@mt\_0x](https://forum.sierrawireless.com/u/mt_0x)\ **Post date:** [October 22, 2021, 1:38pm UTC](https://forum.sierrawireless.com/t/rc7620-1-cannot-open-tcpcnx-after-cgatt-0/25288/1 "2021-10-22T13:38:19Z")
Hi, we recently started using RC7620-1 TCP Socket. All things work good until we disconnect PS network using AT+CGATT=0. After this KTCPCNX=1 don’t work anymore and the KCNXCFG never connect again giving urc +KCNX\_IND: 1,4,1 I Attach a full log for details, all works until line 86/88 (when I made AT+CGATT=0). This behavior is totally replicable. [log\_RC7692.txt](https://forum.sierrawireless.com/uploads/short-url/aNXmmotGNXWbmgCnRz08K1H8fz3.txt) (2.4 KB) The module is connected to a LTE network under good coverage ---
**Author:** ![mt\_0x](https://avatars.discourse-cdn.com/v4/letter/m/278dde/32.png) [@mt\_0x](https://forum.sierrawireless.com/u/mt_0x)\ **Post date:** [October 22, 2021, 2:37pm UTC](https://forum.sierrawireless.com/t/rc7620-1-cannot-open-tcpcnx-after-cgatt-0/25288/2 "2021-10-22T14:37:47Z")
The issue seems strictly related to AT+CGACT=0,1 and AT+CGACT=1,1. Omitting AT+CGACT=0,1 and AT+CGACT=1,1 do the magic ---
**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 22, 2021, 5:07pm UTC](https://forum.sierrawireless.com/t/rc7620-1-cannot-open-tcpcnx-after-cgatt-0/25288/3 "2021-10-22T17:07:35Z")
probably you need to +KTCPCLOSE and +KTCPDEL the socket and reopen the socket. ---
**Author:** ![mt\_0x](https://avatars.discourse-cdn.com/v4/letter/m/278dde/32.png) [@mt\_0x](https://forum.sierrawireless.com/u/mt_0x)\ **Post date:** [October 26, 2021, 3:32pm UTC](https://forum.sierrawireless.com/t/rc7620-1-cannot-open-tcpcnx-after-cgatt-0/25288/4 "2021-10-26T15:32:12Z")
+KTCPCLOSE and +KTCPDEL have been sent at line 67 and 71 ---
**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 26, 2021, 3:40pm UTC](https://forum.sierrawireless.com/t/rc7620-1-cannot-open-tcpcnx-after-cgatt-0/25288/5 "2021-10-26T15:40:27Z")
Why do you need to disconnect PS? ---
**Author:** ![mt\_0x](https://avatars.discourse-cdn.com/v4/letter/m/278dde/32.png) [@mt\_0x](https://forum.sierrawireless.com/u/mt_0x)\ **Post date:** [October 26, 2021, 3:47pm UTC](https://forum.sierrawireless.com/t/rc7620-1-cannot-open-tcpcnx-after-cgatt-0/25288/6 "2021-10-26T15:47:29Z")
Power saving with fast reconnection time ---
**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 26, 2021, 3:58pm UTC](https://forum.sierrawireless.com/t/rc7620-1-cannot-open-tcpcnx-after-cgatt-0/25288/7 "2021-10-26T15:58:00Z")
Maybe you can try flight mode ---
**Author:** ![mt\_0x](https://avatars.discourse-cdn.com/v4/letter/m/278dde/32.png) [@mt\_0x](https://forum.sierrawireless.com/u/mt_0x)\ **Post date:** [October 26, 2021, 4:06pm UTC](https://forum.sierrawireless.com/t/rc7620-1-cannot-open-tcpcnx-after-cgatt-0/25288/8 "2021-10-26T16:06:44Z")
Sure, this is a (more aggressive) power saving option, but in flight mode the device cannot receive sms. Anyway, I’m porting a project from HL7692 to RC7620-1 and switching off PS works quiet well in HL. It works well on RC module too but without sending AT+CGACT (I don’t have an explanation for this) 🙂