Just wondering if there is anything our PA can do to protect from this kind of exploit?
There are a few candidates in the threatvault:
This event indicates that someone want to exhaust the apache resources, as described by slowloris.
This event indicates a DOS attack against IIS server.
There is also zone-protection but I cant find any good setting regarding "slow" connections in there (only stuff like number of concurrent sessions etc).
Edit: Hopefully these docs might be helpful:
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