XF 1.4 My forum is getting blocked and flagged with Poor Web Reputation

If you just launched it -- particularly with a new domain -- that would probably point to a lack of reputation or history, so that would probably fit with restrictive firewalls blocking it. It's unlikely you can do much about it other than wait; it's not really something related to XenForo.
 
Many enterprise firewalls and Internet proxies rely on shared web filter databases.

I checked your forum on McAfee's SmartFilter one and indeed it is showing as no reputation/uncategorised.

Go here and submit your forum URL as category Forum/Bulletin Board, that may help.
TrustedSource - Customer URL Ticketing System

I've done this for a few websites that were mis categorised as gambling websites..
 
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