The cookie is named sophos.com. Pretty much every webpage will try to put at least one cookie on a computer accessing it. With the exception of cookies used to store logon information, etc., there is no valid reason for a site to put a cookie on a computer so I block the invasive things. Granted, most are harmless, but some are not; they can be used for targeted advertising (both an invasion of privacy and annoying) or even malicious purposes. Besides, it's my darned computer and I have the right to determine what gets put on it and what doesn't.
In this case it's sloppy web design. When one has cookies blocked, most websites will try only so many times to put the cookie on a computer (typically no more than ten or so) then allow access to the site (although many sites insist on either allowing their cookie or enabling all cookies to before allowing access to the site). If one has their browser set to notify whenever a website tries to put a cookie on one's computer (as I do), then one normally has the opportunity to either allow the computer to accept the cookie, block it for that one time only, or block it permanently. Unfortunately, either many websites designers failed error trapping 101 and fail to design their sites to properly handle cookies or the site is up no good, such as tracking (aka snooping), targeted advertising, etc. Another example of sloppy webdesign are sites that use a third party to handle transactions, etc. that needs its own cookie to store information needed for a transaction but do not rename that third party's cookie to connect it to the website. Accidentally block that third party cookie and good luck identifying it or even determining it is the cause of access problems since the sloppy error trapping throws up the wrong error message or a genric one that tells you nothing (i have yet to have a site's tech help identify that as a the cause of an access problem; they never even know the name of the third party cookie. Sloppily designed websites, besides being annoying, could also allow themselves to become infected and pass that infection along.