Private key does not match the certificate public key, reason

After enabling SSO, Plesk will not start with the error:

(network.c.377) SSL: Private key does not match the certificate public key, reason: error:xxxxx:PEM routines:PEM_read_bio:no start line /etc/sso/sso.pem

Do you know how to fix ?

This issue can be fixed by:

[from ssh command line]

# cp /usr/local/psa/admin/conf/httpsd.pem /etc/sso/sso.pem

[restart httpd]

# service httpd restart

[start plesk]

# service psa start