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Various symptoms :
1) Hostname in the status line (final line next to system name) is truncated.
2) Hostname in the ABAP/4 field Sy-Subrc is truncated.
3) RFC connections with the destination NONE cause the error message : "Unable to determine host address: NiHostToAddr failed..."
4) Error in application programs which work with these hostnames, for example ST02.
Internal restriction in the SAP System.Solution
To be on the safe side, the hostname of a computer (command hostname or
uname -a) should not be longer than 8 letters in older releases.
Please refer to the installation guide or upgrade guide to find the
maximum hostname lengths in the relevant release.