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Quite often I receive a warning symbol (red exclamation point) on top of the 'lock' when I access certain sites. When I mouse over the symbol, I receive a message "Warning: Contains unauthenticated content". Is there a fix for this problem?

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This problem occurs when I access my credit union, brokerage account, and credit card accounts. Very alarming!!!

This problem occurs when I access my credit union, brokerage account, and credit card accounts. Very alarming!!!

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Yes it is alarming. A "supposedly" secure web page that includes content from non-secure servers. Complain to the webmaster of those websites.

If you right-click those pages and select View Page Source, you can use "Find" to locate the addresses of the servers delivering non-secure data for that page. Use http as the filter in the Find bar to locate those "http" addresses - you'll also see all the "secure" addresses - https, as you use "Next" to advance down the source of the page.