What does 423 friendly mean?

"423 friendly" is not a commonly understood phrase or term. It's possible that it has a specific meaning within a particular context or community, but without more information, it's difficult to decipher.

To understand what "423 friendly" means, we need more context. Could you please provide the following:

* Where did you encounter this phrase? (e.g., online forum, chat room, social media post)

* What was the context of the phrase? (e.g., a conversation about a specific topic, a description of a product)

* Is there any other relevant information? (e.g., a username, a specific website, a location)

Once I have more context, I can better understand the meaning of "423 friendly."