# Can not connect to the broker: Ungraceful Disconnects from unknown clients **URL:** \ **Category:** HiveMQ Community Edition\ **Created:** [June 23, 2020, 3:34am UTC](https://community.hivemq.com/t/can-not-connect-to-the-broker-ungraceful-disconnects-from-unknown-clients/241 "2020-06-23T03:34:01Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![chengxiangwang](https://avatars.discourse-cdn.com/v4/letter/c/a9a28c/32.png) [@chengxiangwang](https://community.hivemq.com/u/chengxiangwang)\ **Post date:** [June 23, 2020, 3:34am UTC](https://community.hivemq.com/t/can-not-connect-to-the-broker-ungraceful-disconnects-from-unknown-clients/241/1 "2020-06-23T03:34:01Z")
I started HiveMQ on my laptop as a single node service, but i can not connect to the broker. And “Ungraceful Disconnects from unknown clients” is always printed in even.log. I am using MQTTBox and below is how i connect: ![image](https://canada1.discourse-cdn.com/flex035/uploads/hivemq1/original/1X/bc238ae0a0ffed7c3ce6c375657c9786731576e7.png) Any one encounter this problem? ---
**Author:** ![michael\_w](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.hivemq.com/michael_w/32/200_2.png) [@michael\_w](https://community.hivemq.com/u/michael_w)\ **Post date:** [June 24, 2020, 7:39pm UTC](https://community.hivemq.com/t/can-not-connect-to-the-broker-ungraceful-disconnects-from-unknown-clients/241/2 "2020-06-24T19:39:22Z")
Hi @chengxiangwang, the keep alive should be the issue here. The keep alive are 16bits so the maximum value is 65.535. Greetings, Michael from the HiveMQ team. ---
**Author:** ![chengxiangwang](https://avatars.discourse-cdn.com/v4/letter/c/a9a28c/32.png) [@chengxiangwang](https://community.hivemq.com/u/chengxiangwang)\ **Post date:** [July 6, 2020, 9:03am UTC](https://community.hivemq.com/t/can-not-connect-to-the-broker-ungraceful-disconnects-from-unknown-clients/241/3 "2020-07-06T09:03:05Z")
@michael_w Thank u! That helped me!