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Make sure your system has a fully qualified hostname. If properly configured during the installation process, the following lines should be in your /etc/hosts file:
{{Box File|/etc/hosts|
| Panel |
|---|
127.0.0.1 localhost.localdomain localhost |
...
Test hostname :
{{Box Code|test host and domain name settings|:
| Panel |
|---|
hostname (outputs your fully qualified name) |
}}
...