Links involving tracking info and/or redirects not working.
Suddenly I'm having issues clicking on links in emails that I get from known sources. Some say the website is blocked ("This website is blocked due to your current protection level. Please contact your network administrator to gain access."), others warn me about invalid certificates (and I ignore and proceed to, as I know the websites), but those pages never load. I've tried everything in another browser, and they function flawlessly, so it's not my Watchguard firewall nor Windows settings. I have the same issue sporadically clicking on email links in Outlook, so it's not only on links clicked IN Firefox (browser-based email). I've completely disabled all the Enhanced Tracking Protection, but still, nothing. I booted up another notebook, and it's exhibiting the exact same behavior (and that notebook doesn't have Norton on it to be an issue, (though I already have it completely disabled on the computer in question).
The tracking redirects that are causing me the post trouble are "http://trk.klclick1.com/ls/click?upn=..." and "https://t.e2ma.net/click/..."
As I mentioned, these are in emails from sources I get regularly. One is a website that sells their own products, and the latter is for a content-oriented site. The one that gave me problems from Outlook was news content, and (curiously enough), clicking on the image yielded the blocked site page, but clicking on the news heading beneath it got me through to the article in question, so I just figured it was an HTML email coding issue.
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Let's investigate these separately:
(1) "This website is blocked due to your current protection level. Please contact your network administrator to gain access."
I don't think that's a normal Firefox warning. Do you know whether your browsing is routed through a company proxy server or security software filter that may check the addresses?
(2) Invalid certificates (and I ignore and proceed to, as I know the websites), but those pages never load
After you click the Advanced button, what is the explanation for the problem? Sometimes a filter like Cisco Umbrella will want to tell you a page is blocked, but the error message can only appear if you change the address to an HTTP address. In order to make it work seamlessly, you need to figure out which filter is causing the issue and import its signing certificate so Firefox trusts the fake site certificates it generates. As a step in the investigation, click the View Certificate button and see who the issuer is. There usually will be a pattern to it if the problem is caused by a security vendor.