# \#ambassador

**URL:** https://hub.mender.io/tag/ambassador/301.md

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## [Mender client rejects the server certificate of mTLS ambassador with Error: "certificate signed by unknown authority, openssl verify rc: 20"](https://hub.mender.io/t/mender-client-rejects-the-server-certificate-of-mtls-ambassador-with-error-certificate-signed-by-unknown-authority-openssl-verify-rc-20/5420)

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**Author:** [@shaomai](https://hub.mender.io/u/shaomai)\
**Replies:** 4\
**Last updated:** [April 26, 2024, 12:50am UTC](https://hub.mender.io/t/mender-client-rejects-the-server-certificate-of-mtls-ambassador-with-error-certificate-signed-by-unknown-authority-openssl-verify-rc-20/5420 "2024-04-26T00:50:44Z")

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Hello everyone, I am testing the mTLS feature with following use case: using https://hosted.mender.io as mender server hosting mTLS ambassador locally in virtual machine with ip address 192.168.3.30 and domain name my…