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Hello.
I would like to share my experience fighting with SPAM and bruteforce.
Some time ago I realized I have a lot of connection with bruteforce attempts and lot of SPAM connections to my mail server, another issue was having lot of web connections ...
Did you find any solution? I have almost same issue, in VSS with 2 4500x units somehow my uplink upload speed is limited (50-60 Mbits/s on 1G link), if i connect same link to another 4500x without vss its not limited (700 Mbits/s on same 1G link). I'...
Just in case someone is looking for similar solution please have a look here - https://supportforums.cisco.com/t5/firewalling/fighting-against-spam-and-bruteforce-with-firepower-security/m-p/3403235#M169983
