My Umbraco installation get hang sometimes and When I looked into log this is what I can see

     2017-06-27 23:16:49,196 [P2344/D4/T17] ERROR Umbraco.Web.Scheduling.KeepAlive - Failed (at "https://{mydomain}:443/umbraco").
System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond {MyIp}:443
   at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
   at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
   --- End of inner exception stack trace ---
   at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar)
   --- End of inner exception stack trace ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Umbraco.Web.Scheduling.KeepAlive.<PerformRunAsync>d__4.MoveNext()

I am using Umbraco Scheduler functionality and this is how it looks.

  <scheduledTasks>

<!-- add tasks that should be called with an interval (seconds) -->
    <task log="true" alias="wbshopcron" interval="10" url="https://mydomain/cronjobs"/>
    <task log="true" alias="sitemapcron" interval="1440" url="https://mydomain/sitemapcronjob"/>

I am using HTTPS for my site and this is how redirects are handled inside web config

    <rewrite>
  <rules>
    <rule name="HTTP to HTTPS redirect" stopProcessing="true">
      <match url="(.*)" />
      <conditions>
        <add input="{HTTPS}" pattern="off" ignoreCase="true" />
        <add input="{HTTP_HOST}" pattern="localhost" negate="true" />
      </conditions>
      <action type="Redirect" url="https://{HTTP_HOST}/{R:1}" redirectType="Permanent" />
    </rule>
    <rule name="Strip www. from URL" stopProcessing="true">
      <match url="^(.*)$" ignoreCase="true" />
      <conditions logicalGrouping="MatchAll">
        <add input="{HTTP_HOST}" pattern="^www\.(.+)$" />
      </conditions>
      <action type="Redirect" url="http://{C:1}/{R:1}" redirectType="Permanent" />
    </rule>
  </rules>
</rewrite>

Some other redirect rules are also there inside Umbraco URlRewriting.Config

    <add name="ProductDetailedRewrite"
   virtualUrl="^~/Product/(.*)/(.*)/(.*)/(.*)/(.*)/(.*)/"
   rewriteUrlParameter="ExcludeFromClientQueryString"
   destinationUrl="~/product-detailed?mainCat=$1&amp;subCat=$2&amp;prdName=$3&amp;$4&amp;$5&amp;$6"
   redirect="Application"
   redirectMode="Permanent"
   ignoreCase="true" />

<add name="seoCanonical"
     virtualUrl="http://mydomain/(.*)"
     rewriteUrlParameter="ExcludeFromClientQueryString"
     destinationUrl="http://www.mydomain/$1"
     redirect="Domain"
     redirectMode="Permanent"
     ignoreCase="true" />

So can anyone please point out why this error happens Again and Again in my live system?