# Some certificate error?

**URL:** <https://forums.suse.com/t/some-certificate-error/43134>\
**Category:** SUSE Virtualization\
**Created:** [May 11, 2024, 9:26pm UTC](https://forums.suse.com/t/some-certificate-error/43134 "2024-05-11T21:26:05Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Ilya1](https://sea2.discourse-cdn.com/flex022/user_avatar/forums.suse.com/ilya1/32/11188_2.png) [@Ilya1](https://forums.suse.com/u/Ilya1)\
**Post date:** [May 11, 2024, 9:26pm UTC](https://forums.suse.com/t/some-certificate-error/43134/1 "2024-05-11T21:26:05Z")

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Hi Everyone,

just install Harvester on two nodes and create a VM. Everithing looks fine, but wfter a few hours I got an error in case try do anithing with the VM.

Internal error occurred: failed calling webhook “[virtualmachineinstances-mutator.kubevirt.io](http://virtualmachineinstances-mutator.kubevirt.io)”: failed to call webhook: Post “[https://virt-api.harvester-system.svc:443/virtualmachineinstances-mutate?timeout=10s](https://virt-api.harvester-system.svc:443/virtualmachineinstances-mutate?timeout=10s)”: tls: failed to verify certificate: x509:

I did reboot of both nodes and the error is gone. Please, can you help me to understand what ia all about? I am totally new in Harvester and Kubernetes. So have no idea from what to start.