Firewall reporting a SYN attack

We have a single sbs2011 server running exchange with AVG, and we noticed that everything, particulalry our internet service is running slowly. On checking our Firewall logs we noticed that it is reporting a SYN attack, which may explain the speed issues.

I dont know the first thing about this kind of attack, so could anyone please provide a step by step approach on how to deal with this?

Many thanks.
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nigelbeatsonAsked:
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R_EdwardsCommented:
can you post part of the log that shows the SYN attack?
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R_EdwardsCommented:
what type of firewall are you using?
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nigelbeatsonAuthor Commented:
it is a Cisco ASDM 6.2(1)
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nigelbeatsonAuthor Commented:
On site today, and will try to provide the requested info.

Many thanks.
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nigelbeatsonAuthor Commented:
Problem appears to have resolved itself? Ie no further problems have been encountered.

Many thanks
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R_EdwardsCommented:
good to hear.
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nigelbeatsonAuthor Commented:
Thanks for your assistance
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