Underscore Not Allowed in Hostname Field

Asset ID:	1-72-1983382.1
Update Date:	2017-05-10
Keywords:

Solution Type Problem Resolution Sure

Solution 1983382.1 : Underscore Not Allowed in Hostname Field

Applies to:

Acme Packet 4500 - Version S-Cx6.3.0 and later
Acme Packet 3820 - Version S-Cx6.3.0 and later
Acme Packet 6300 - Version S-Cz7.0.2 and later
Acme Packet 6100 - Version S-Cz7.0.2 and later
Acme Packet 4600 - Version S-Cx6.3.0 and later
Information in this document applies to any platform.

Symptoms

The SBC Administrator is unable to use an underscore "_" within a hostname. If attempted, the system throws an error message.

Cause

From release SCX630 and onwards the hostname syntax and allowed characters have become more stringent in compliance with RFC standards.

It is the RFC's that dictate what is allowed as a hostname. The allowed characters are A-Z, a-z, 0-9, - and ".". Other keys in the DNS system such as service records may use the underscore "_", but not the hostname.

Solution

Change the hostname to in accordance to standards defined in published RFC's

Reference

The Official SBC Documentation specifically outlines what characters are allowed within a hostname for a Fully Qualified Domain Name (FQDN). (This detail may be found starting on page 28.)

https://docs.oracle.com/cd/E50366_01/doc/sbc_scx640_aclireference.pdf

Additional details regarding these standards can be found within the following RFCs

RFC's 952 and 1123 help govern what is allowed as a hostname.
RFC 1178 will advice you in choosing a good hostname per the standards.

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