Back office Login Error 400 (Bad Request)

Questions
1

Hello, I’m trying to login from “* .com / umbraco”.

The developer console “umbraco / backoffice / UmbracoApi / Authentication / PostLogin 400 (Bad Request)” shows this error.

I see these logs in “Apps_Data / Logs” file.

System.Net.Http.HttpRequestException: Request failed with status code “NotFound”. Request content = "

The resource cannot be found. body {font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;} p {font-family:"Verdana";font-weight:normal;color:black;margin-top: -5px} b {font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px} H1 { font-family:"Verdana";font-weight:normal;font-size:18pt;color:red } H2 { font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon } pre {font-family:"Consolas","Lucida Console",Monospace;font-size:11pt;margin:0;padding:0.5em;line-height:14pt} .marker {font-weight: bold; color: black;text-decoration: none;} .version {color: gray;} .error {margin-bottom: 10px;} .expandable { text-decoration:underline; font-weight:bold; color:navy; cursor:pointer; } @media screen and (max-width: 639px) { pre { width: 440px; overflow: auto; white-space: pre-wrap; word-wrap: break-word; } } @media screen and (max-width: 479px) { pre { width: 280px; } } 
<body bgcolor="white">

        <span><H1>Server Error in '/' Application.<hr width=100% size=1 color=silver></H1>

        <h2> <i>The resource cannot be found.</i> </h2></span>

        <font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif ">

        <b> Description: </b>HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. &nbsp;Please review the following URL and make sure that it is spelled correctly.
        <br><br>

        <b> Requested URL: </b>/umbraco/RestServices/ScheduledPublish/Index<br><br>

        <hr width=100% size=1 color=silver>

        <b>Version Information:</b>&nbsp;Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4330.0

        </font>

</body>
".

I searched and found some suggestions, I tried these;
to make “useLegacyEncoding = false”
Making “userNoConsole = false”
and finally restart “appPool”.

but none of them worked.

<rewrite>
         <rules>
             <rule name = "Http to Https" enabled = "true" stopProcessing = "true">
                 <match url = "(. *)" />
                 <conditions>
                     <add input = "{HTTPS}" pattern = "^ OFF $" />
                 </conditions>
                 <action type = "Redirect" url = "https: // {HTTP_HOST} {REQUEST_URI}" />
             </rule>
         </rules>
     </rewrite>

this area is like this

I am facing this problem in V7.6.4, I cannot login with any users

please ,Help me

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/105439-back-office-login-error-400-bad-request