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Home > Success Center > Network Performance Monitor (NPM) > NPM - Knowledgebase Articles > The DNS Hostname is not a valid format

The DNS Hostname is not a valid format

Created by Kate Asaff, last modified by Magdalena.Markova on Oct 22, 2018

Views: 1,694 Votes: 0 Revisions: 11


Error: The DNS hostname (name) is not a valid format.


  • NPM
  • SAM
  • SRM
  • NCM
  • NTA
  • EOC
  • UDT
  • IPAM
  • VNQM


The DNS hostname does not fit the standard format as described in RFC 952.


  1. The DNS hostname must fit the standards laid out in RFC 952 (© 1985, IETF Network Working Group, available at, obtained on October 22, 2018).  
    Specifically, only the following characters are acceptable:

    - (hyphen, not underscore)


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