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The hostname is the host short name "myserver" or will be "localhost" rather than the FQDN (Fully Qualified Domain Name)
1) Open /etc/hosts for editing
2) Add the following to the hosts file...
127.0.0.1 <fqdn>l localhost localhost.localdomain localhost4
For example: 127.0.0.1 myserver.mydomain.com localhost localhost.localdomain localhost4
3) Save changes