Do you what HSTS is?
In this post,MiniToolwill introduce HSTS and show you how to clear HSTS configs to solve HSTS issues.
What Is HSTS?
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The full name of HSTS isHTTP Strict Transport Security.
HSTS is an IETF standards track protocol, which is specified in RFC 6797.
It is strongly recommended to use HSTS parameters in your web online window.

It can guarantee data safety when you use your web web app and protect your personal data.
Using chrome://net-internals/#dns can help you flush the DNS cache on Chrome.
If chrome://net-internals/#dns doesnt work, try the methods in this post.
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How to Clear HSTS tweaks in Chrome?
Step 2: Copy and pastechrome://net-internals/#hststo the address bar and pressEnter.
Step 4: In theDelete domain security policiesfield, enter the domain name and press theDeletebutton.

How to Clear HSTS parameters in Firefox?
Step 2: PressCtrl + Shift + Hto launch the browsing history.
Step 3: Find the site you want to clear HSTS options.

Then, right-click that site and selectForget About This Site.
This will clear all the current site data in Firefox.
Now, you should open your needed site normally.

How to Clear HSTS prefs in Internet Explorer?
Step 1: PressWindows + Rto open Run.
Step 5: ClickFEATURE_DISABLE_HSTS.
Then, name it iexplore.exe.
Step 7: initiate the newly-created value and change the value data to1.
Step 8: ClickOKto save the change.
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Main\FeatureControl\
Step 10: Create a new key and name itFEATURE_DISABLE_HSTS.
Step 11: Create a new DWORD value in FEATURE_DISABLE_HSTS and name itiexplore.exe.
Step 12: kick off the newly created value and change the value data to1.
Step 13: ClickOKto save the change.
The 0 value data is to activate the feature and the 1 value data is to inactivate the feature.