1 If the UNIX or Linux hostname is incorrect, do one of the following: 2  Change the hostname on the UNIX or Linux host to the correct one and create a new certificate. 3  Create a new certificate with the desired hostname.or this certificate to be valid, the common name (CN) that is used in the certificate must match the fully qualified domain name (FQDN) that is resolved by Operations Manager. If the CN does not match, you will see the following error when you run the Discovery Wizard: Copy.