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Certificate verify failed - OpenVPN




I have been using the VPN server application on DS918 + 6.2.3. for a long time. I haven't been able to connect to all devices via VPN since about yesterday. It should be a Synology DDNS certificate issued by R3.

I tried to renew the certificate and create a new one. Unfortunately, the problem still persists. When I tried to start the OpenVPN server on the Asus rt-at56u router, everything worked.

The extract from the log is as follows


2021-10-01 17:37:58.237592 VERIFY ERROR: depth=2, error=unable to get issuer certificate: C=US, O=Internet Security Research Group, CN=ISRG Root X1,


2021-10-01 17:37:58.237757 OpenSSL: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed

2021-10-01 17:37:58.237774 TLS_ERROR: BIO read tls_read_plaintext error

2021-10-01 17:37:58.237786 TLS Error: TLS object -> incoming plaintext read error

2021-10-01 17:37:58.237797 TLS Error: TLS handshake failed

Any ideas?

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