Oracle E-Business Suite Release 12 has a restriction on the lengths of the host names you can use. The exact restriction depends on which of the following EBS Release Update Packs you have applied:
- EBS Release Update Pack 12.2.5
- EBS Release Update Pack 12.2.4, 12.2.3, 12.2.2, 12.1.3, 12.1.1
Each of these will be considered in turn.
Restriction in EBS Release Update Pack 12.2.5
When you run Rapid Install, you must ensure that the host names of your database node and primary applications node do not exceed 30 characters in length.Restriction in EBS Release Update Packs 12.2.4, 12.2.3, 12.2.2, 12.1.3, 12.1.1
The node names returned by the operating system for the database tier and application tier nodes must be no longer than 30 characters. If you configure your system to return only the host name for the node, then the host name must be no longer than 30 characters. If you configure your system to return the fully qualified domain name (FQDN), then the FQDN must be no longer than 30 characters, including the host name, domain name, and periods (.) used as separators.
Affected Rapid Install Screens
The following screens are where you need to ensure you enter host names that meet the current requirements.
Rapid Install Database Node Configuration Screen

Rapid Install Primary Applications Node Configuration Screen

This restriction is mentioned in Oracle E-Business Suite Installation Guide: Running Rapid Install and the release notes for the affected releases.
References- Oracle E-Business Suite Release Notes, Release 12.2 (Doc ID 1320300.1)
- Oracle E-Business Suite Applications DBA and Technology Stack Release Notes for Release 12.2.5 (Doc ID 2050998.1)
- Oracle E-Business Suite Applications DBA and Technology Stack Release Notes for Release 12.2.4 (Doc ID 1911660.1)
- Oracle E-Business Suite Technology Stack and Applications DBA Release Notes for Release 12.2.3 (Doc ID 1606170.1)
- Oracle E-Business Suite Technology Stack Release Notes for Release 12.2.2 (Doc ID 1376618.1)
- Oracle E-Business Suite Technology Stack Release Notes for Release 12.1.3 (Doc ID 1098650.1)
- Oracle Applications Release Notes, Release 12.1.1 (Doc ID 798258.1)
