Tip of the day: You can allow trusted users to send more messages per second without having to make them IRCOp. Especially useful for bots.

Translations:FAQ/417/en

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This means clients are trying(!) to connect to your server at the specified rate per second. The default setting is 1000 and the (non-adjustable) sample interval is 5 seconds, so hitting this 1000 connects per second for 5 seconds straight would be unusual in a normal situation. This could therefore be an attack with many drones trying to connect (but likely most of them not coming online on IRC, already being rejected before that). There is also a small chance that this warning shows up in non-attack situations such as if there was a network outage before and the network is back and lots of users are (re)connecting to your server.