# Knx lost connection after changing router

**URL:** <https://community.homey.app/t/knx-lost-connection-after-changing-router/42443>\
**Category:** Apps\
**Tags:** app\
**Created:** [February 5, 2021, 11:02am UTC](https://community.homey.app/t/knx-lost-connection-after-changing-router/42443 "2021-02-05T11:02:11Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![giorgiobad](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/giorgiobad/32/33954_2.png) [@giorgiobad](https://community.homey.app/u/giorgiobad)\
**Post date:** [February 5, 2021, 11:02am UTC](https://community.homey.app/t/knx-lost-connection-after-changing-router/42443/1 "2021-02-05T11:02:11Z")

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Hi, I recently changed my router and Homey can’t find the KNX IP Interface 731 anymore. I have the same IP class and KNX IP Interface 731 has the same ip. I tried rebooting homey and rebooting knx app. The router can see the KNX IP Interface 731 and the device is pingable.  
But inside homey app I always have the warning “selected ip interface not found” and also trying re-adding a light I can’t find KNX IP Interface 731 also trying to ad manually.  
anyone has some advices? I’d like to avoid resetting all to factory…  
Thanks.

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**Author:** ![Jan\_Gustafsson](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jan_gustafsson/32/29903_2.png) [@Jan\_Gustafsson](https://community.homey.app/u/Jan_Gustafsson)\
**Post date:** [December 12, 2021, 2:05pm UTC](https://community.homey.app/t/knx-lost-connection-after-changing-router/42443/2 "2021-12-12T14:05:10Z")

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Hi,

Have you solved the problem?  
I have the same problem. After restart or firmware update Home loose contact with KNX. Requires a lot of work to get it work again.

BR JG