![](https://k.kakaocdn.net/dn/QU88W/btqFhK4oROW/MDkdNZK7LwVO92zQtt0B2K/img.png)
Chain issue is very serious problem in websites or server.
Let's figure out it.
![](https://k.kakaocdn.net/dn/1s9Th/btqFeNu81uX/4HQXik1Nt8UxwFjFM6KLV0/img.png)
apache(yourdomain.conf){in etc/apache2/sites-available}
-ssl example.
<VirtualHost *:443>
ServerName your domain
SSLEngine on
SSLProtocol all -SSLv2 -SSLv3 or TLSv1 TLSv1.1 TLSv1.2 TLSv1.3
SSLCertificateKeyFile yourdomain.key.pem
SSLCertificateFile yourdomain.crt.pem
SSLCertificateChainFile Chainfile of domain
SSLCACertificateFile CA certificatefile
</VirtualHost>
-segtigo limited ssl example.
<VirtualHost *:443>
ServerName your domain
SSLEngine on
SSLProtocol all -SSLv2 -SSLv3 or TLSv1 TLSv1.1 TLSv1.2 TLSv1.3
SSLCertificateKeyFile yourdomain.key.pem
SSLCertificateFile yourdomain.crt.pem
SSLCertificateChainFile USERTrust_RSA_Certification_Authority.crt
SSLCACertificateFile AAA_Certificate_Services.crt
</VirtualHost>
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