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Fortinet Technical Discussion Forumに以下の記事がありました。

Symantec Updates -- Use URL Exemptlist

A PC/server behind a FGT with HTTP scanning enabled will sometimes encounter problems obtaining Symantec/Norton updates.

The simplest workaround is to use the URL exemptlist to disable AV scanning for that one site.

Put the following in the URL exemptlist:
symantecliveupdate.com

RE: Symantec Updates -- Use URL Exem... (in reply to chall)

According to Symantec, they could use update servers from any of the following URLs:

The domains that LiveUpdate accesses are:
HTTP: symantec.com, symantecliveupdate.com, and akamai.net.
FTP: speedera.net