# (Kerlink-iFemtoCell-evolution) "not connected" to TTN

**URL:** <https://www.thethingsnetwork.org/forum/t/kerlink-ifemtocell-evolution-not-connected-to-ttn/45896>\
**Category:** Kerlink Gateways\
**Created:** [March 24, 2021, 9:42am UTC](https://www.thethingsnetwork.org/forum/t/kerlink-ifemtocell-evolution-not-connected-to-ttn/45896 "2021-03-24T09:42:02Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![mari](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/mari/32/35697_2.png) [@mari](https://www.thethingsnetwork.org/forum/u/mari)\
**Post date:** [March 24, 2021, 9:42am UTC](https://www.thethingsnetwork.org/forum/t/kerlink-ifemtocell-evolution-not-connected-to-ttn/45896/1 "2021-03-24T09:42:02Z")

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Hi,  
the status of my gateway in console is “not connected” as the picture below, but I do not know what the problem could be to fix that. I would greatly appreciate if someone could advise me in this regard. my gateway is Kerlink “Wirnet iFemtoCell-evolution”. I added gateway EUI as it is written under the gateway and also with the command _cat /var/run/lora/gateway-id.toml_ .  
before configuration I had done factory reset twice, is it possible that this made it changed?  
I did Keros 4.3.3: CPF configuration as it is written in Kerlink website, and firmware version is Keros 4.3.3  
Kerlink provides a packet forwarder (CPF)  
I am using TTN V2, and there is no Data payload in my application side.

![d587b87423d97fb0e087be51abd5b70f7072284f](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/d/5/d587b87423d97fb0e087be51abd5b70f7072284f.png)

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**Author:** ![mari](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/mari/32/35697_2.png) [@mari](https://www.thethingsnetwork.org/forum/u/mari)\
**Post date:** [March 24, 2021, 12:37pm UTC](https://www.thethingsnetwork.org/forum/t/kerlink-ifemtocell-evolution-not-connected-to-ttn/45896/2 "2021-03-24T12:37:32Z")

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I found other Kerlink users have had the same problem and they responded that “the problem is with firewall, and changing the /user/spf/bin/execute\_spf.sh file and **editing the IPTable by replacing all “-A” (append) options with a “-I”** **(insert)** solved their problem”, **but they used (SPF) semtech packet forwarder while I did Keros 4.3.3: (CPF) configuration** as it is written in Kerlink website, and my firmware version is Keros 4.3.3.

I would appreciate if someone could advise me regarding these questions:

**1)** as there is no /user/spf/bin/execute\_spf.sh file used in this version, which file I should open to edit the IPTable by replacing all “-A” (append) options by a “-I” (insert) for Keros 4.3.3 to connect TTN?

**2)** how I can do that using SSH. Can you tell me in details please?

**3)** For the future usage and connecting it to ChirpStack, if after changing this rule to -I , I do a factory reset and upgrade with _liveburner IPK_, will these changes I made revert back to the default?

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**Author:** ![descartes](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/descartes/32/47220_2.png) [@descartes](https://www.thethingsnetwork.org/forum/u/descartes)\
**Post date:** [March 24, 2021, 1:21pm UTC](https://www.thethingsnetwork.org/forum/t/kerlink-ifemtocell-evolution-not-connected-to-ttn/45896/3 "2021-03-24T13:21:00Z")

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See [Kerlink iFemtocell - connect to TTN? - #35 by mari](https://www.thethingsnetwork.org/forum/t/kerlink-ifemtocell-connect-to-ttn/9198/35)

Cross posts, so closing this new thread.

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**Author:** ![descartes](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/descartes/32/47220_2.png) [@descartes](https://www.thethingsnetwork.org/forum/u/descartes)\
**Post date:** [March 24, 2021, 1:21pm UTC](https://www.thethingsnetwork.org/forum/t/kerlink-ifemtocell-evolution-not-connected-to-ttn/45896/4 "2021-03-24T13:21:04Z")

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