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Re:Show HN: Halloy – A GUI Application in Rust for IRC by doublerabbit on Friday June 30, 2023 @01:11PM (#36538601)
Some Channels enforce the flag for registered users.

I've visited networks where you have forced you to register nicks. You have the option to leave, but same principle.

Re:Show HN: Halloy – A GUI Application in Rust for IRC by tredre3 on Friday June 30, 2023 @02:40PM (#36540087)
Some channels do indeed enforce registered users. But the message you quoted is 100% because you were using someone's nickname and they enabled nick protection.
Re:Show HN: Halloy – A GUI Application in Rust for IRC by doublerabbit on Friday June 30, 2023 @04:22PM (#36541684)
No. My nick was an unregistered nick. I know IRC -.- don't tell me otherwise.

"To use this server you MUST register with IRC services."

The server had mandatory nickserv registration.