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Non_compliant_machine_names

I would like to know, why there was the following statement about hostnames included in Orion's v9 release notes?

Special Characters in Machine Names

Due to limitations based on RFC 952 - DOD Internet Host Table Specification that are maintained by Windows Internet Information Services (IIS), the machine names of monitored network devices may only be composed of the following:

Alphabetic characters (a-z or A-Z, case-insensitive)
Digits (0-9)
Minus sign (-)
Period (.)

Were there any performance issues or something else?

For historical reasons we have hostnames with underscores and they are bundled in VPN certificates, so it is pain to rename.