Thanks all.
I have been looking at my browser security settings but have been unsuccessful in determining a local cause.
I did try using my cell phone, brave browser, and using cellular data only (Wi-Fi turned off), but still receive the same error.
I am able to view "Errers and Varietys" uploads on the page itself, it's just when clicking on the image to enlarge that the problem occurs. (but strangely only with E&V's images).
I am able to view E&V's images by stripping the characters before the query string as well as the "pic=" part... for example, when clicking the image to enlarge, the URL (which fails) is:
https://www.coincommunity.com/forum...pic.asp?pic=https://www.coincommunity.com/forum/uploaded/errers%20and%20varietys/20240424_win_20240424_12_58_40_pro-ccfopt.jpg
If I strip all before the query string and the "pic=" ("
https://www.coincommunity.com/forum...c.asp?pic=") and simply navigate to the URL of the image, it works fine:
https://www.coincommunity.com/forum...o-ccfopt.jpgThanks for the feedback. I'll keep looking for a solution on my end.