# Error while Adding slave node on Master node

**URL:** <https://discuss.kubernetes.io/t/error-while-adding-slave-node-on-master-node/7712>\
**Category:** General Discussions\
**Tags:** k8s-blog\
**Created:** [August 30, 2019, 11:35am UTC](https://discuss.kubernetes.io/t/error-while-adding-slave-node-on-master-node/7712 "2019-08-30T11:35:48Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Saikumarsgg](https://avatars.discourse-cdn.com/v4/letter/s/d78d45/32.png) [@Saikumarsgg](https://discuss.kubernetes.io/u/Saikumarsgg)\
**Post date:** [August 30, 2019, 11:35am UTC](https://discuss.kubernetes.io/t/error-while-adding-slave-node-on-master-node/7712/1 "2019-08-30T11:35:48Z")

</div>

sh@kubeslave:~$ sudo kubeadm join 192.168.1.176:6443 --token cwxswk.hbkuu4jua82o80d1 --discovery-token-ca-cert-hash sha256:ff1b0cfe5aec94f90a42bdb45d2b8bfde34006017c0e3f3026a84388f46a5495  
[sudo] password for sh:  
[preflight] Running pre-flight checks  
error execution phase preflight: couldn’t validate the identity of the API Server: abort connecting to API servers after timeout of 5m0s  
Please let me know the way to fix it.