Incorrect behavior when max logins limit is reached
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                 Key: FTPSERVER-364
                 URL: https://issues.apache.org/jira/browse/FTPSERVER-364
             Project: FtpServer
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.0.4
            Reporter: Sai Pullabhotla
            Priority: Minor
             Fix For: 1.0.5


When max logins limit is reached, the server currently behaves as below: 

Accepts connections from new clients and keeps them open 
Let's the new clients issue some commands (like I can go ahead and issue as 
many invalid commands as I want) 
When the client sends a valid USER command with username argument, the server 
then figures out that it has reached the max limit. 

I think t would probably makes sense to change the behavior as follows: 

When a new client comes in, check if we reached the cap, and if so, send 421 
message right away, instead of sending a 2xxx reply. 


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