Suddenly starts receiving alert when trying to login to wordpress admin panel. Hosting is on IIS server. It is type of alert prompt box given by firefox browser only with following text:

To display this page, Firefox must send information that will repeat any action (such as a search or order confirmation) that was performed earlier.

Wordpress admin login is the core functionality of wordpress. I didn't make any change in core files. Please suggest how can i solve this.

I already checked this one (To display this page, Firefox must send information that will repeat any action (such as a search or order confirmation) that was performed earlier)!

Anybody please help?

No change did on server side. It was working before that fine.

Update:- I spent little time with server guy and we have checked there is not any redirection rule present on IIS server. Only one binding between http & https request setup and one url rewriting rule is there, as below:-

<rule name="wordpress" patternSyntax="Wildcard">
    <match url="*" />
        <conditions>
            <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
            <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
        </conditions>
    <action type="Rewrite" url="index.php" />
</rule>```