# HL8548-G modem freezes after KTCPSND **URL:** \ **Category:** Legacy HL Series\ **Created:** [March 30, 2016, 3:08am UTC](https://forum.sierrawireless.com/t/hl8548-g-modem-freezes-after-ktcpsnd/8490 "2016-03-30T03:08:18Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![bezakb](https://avatars.discourse-cdn.com/v4/letter/b/a88e57/32.png) [@bezakb](https://forum.sierrawireless.com/u/bezakb)\ **Post date:** [March 30, 2016, 3:08am UTC](https://forum.sierrawireless.com/t/hl8548-g-modem-freezes-after-ktcpsnd/8490/1 "2016-03-30T03:08:18Z")
Hi, I’m trying to follow client mode example of TCPIP exchange from AT document. I get OK response for all commands until KTCPSND command, once I send this one I never get CONNECT from modem and after that modem does not respond to anything (data terminated with KPATTERN, +++, other commands) until I reset it. Any ideas what is going ion here ? thanks Branislav my modem is HL8548-G, KGSN returns SV:04 here is my log AT+CSQ AT+CSQ +CSQ: 16,99 OK AT+KCNXCFG=1,“GPRS”,“mnet.bell.ca.ioe”,“login”,“password”,“IPV4”,“0.0.0.0”,“0.0.0.0”,“0.0.0.0” AT+KCNXCFG=1,“GPRS”,“mnet.bell.ca.ioe”,“login”,“password”,“IPV4”,“0.0.0.0”,“0.0.0.0”,“0.0.0.0” OK AT+KTCPCFG=1,0,“[www.google.com](http://www.google.com)”,80 AT+KTCPCFG=1,0,“[www.google.com](http://www.google.com)”,80 +KTCPCFG: 1 OK AT+KTCPCNX=1 AT+KTCPCNX=1 OK +KCNX\_IND: 1,4,1 +KCNX\_IND: 1,1,0 +KTCP\_IND: 1,1 AT+KTCPSND=1,18 AT+KTCPSND=1,18 - this is last response from modem, terminated with single ‘\r’. no other response after this until hardware reset ---
**Author:** ![bezakb](https://avatars.discourse-cdn.com/v4/letter/b/a88e57/32.png) [@bezakb](https://forum.sierrawireless.com/u/bezakb)\ **Post date:** [March 31, 2016, 5:19am UTC](https://forum.sierrawireless.com/t/hl8548-g-modem-freezes-after-ktcpsnd/8490/2 "2016-03-31T05:19:27Z")
Seems that the problem was due to very old version of firmware. Once I upgraded to 5.5.14 it started to work.