So let me get this right.
2 failed logins = captcha
Take for example a small wordlist of 1million words for this to even work at all you will need 500,000 proxys (Goodluck!)
Taking into account a regular pc with a 2.2ghz quad core can do up 340m words/sec (if there was no capctcha)
So basically a small wordlist with not much chance of cracking the password plus 500,000 proxys would take you about 3months to get throught the list (Not taking into account proxy timeouts etc)
tbh this fails.
Expecting server.exe to be dorpping when i reverse hes bin.