Users to haven't attempted to join in awhile are getting join throttled

[Mxchael]

I've had complaints of users getting join throttled by Waterfall when they haven't joined in awhile. (Minutes-Hours) when my join-throttle is set at 4000 like normal.

Unfortunately I haven't yet re-produced.

[Techcable]

I need instructions to reproduce in order to fix your issue.

These users may want to disable your join-throttle in order to attack you.
Their ISP/family may also be putting multiple people on the same ip, who are joining at the same time.

I may be able to add the 'last-join' to logging for join throttling, to see if it was wrong.

[Techcable]

@aikar might have found the cause

theres a bug in the client if the user clicks multiple times, it tries to login multiple times. with the subsequent clicks kicking the previous.
so that would likely block the connection thats actually going to connect. should allow 4 per second, which stops the dos and avoids the issue
its why you sometimes see people do login spam

[Techcable]

I'm concerned changing this to 4 per second would unfix #12 and that log spam.
I'm also concerned this will leave us more vulnerable to DDOS.

[Techcable]

@PhanaticD

thats the cause of the invisibility bug i was talking about a while ago
players cant use commands either if they log in with that state
so really u should be blocking it

[AlfieC]

Just saying - somebody connecting more than a few times per second is not 'DDoS'. The reason there are two Ds in 'DDoS' is because it's distributed. From multiple IPs. Therefore it is irrelevant to DDoSing.

[Janmm14]

@AlfieC Yeah, he probably ment a DoS-attack. However a dDoS-Layer7-Attack on minecraft servers consists normally of proxies being itself so fast in connecting that it will hit the DoS-Protection.

[AlfieC]

I can't take you seriously with 'dDoS'.

[Janmm14]

thx