WS.Reputation.1 is a generic detection. . it means Sonar / Download Insight was unable to verify the software publisher against its own knowledge base.
It means that it has not seen very many people with Norton or Symantec Endpoint Protection Download it and it is still unsure how to score it. IE bad or good. the more that people with Norton or Symantec Endpoint Protection download it and no negative effects are noted the reputation score goes up until it is trusted. (for that HASH).
if the package is small .. i'd disable Norton and then submit the file here for analysis .. : https://www.virustotal.com/
then see if any other major vendors (Kaspersky, Sophos, Trend) flag the file. if they dont it is likely fine.
Fireweall wont, it would to trigger IPS or IDS for that to occur. The file-level AV and or reputation service would need to tigger on it.
I have it in queue for a manual review with an engineer .. wont hear back right away though.
the only reason i find it suspicious is the small application size for what it is supposed to do combined with a Trigger from Trend... had it be some crappy third party free AV like clam or AVG i'd be less suspicious ..