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murphybeck

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  1. This error is a network-related error occurred while establishing a connection to the Server. It means that the error is occurring because there is no server listening at the hostname and port you assigned. It literally means that the machine exists but that it has no services listening on the specified port . So, no connection can be established. Generally, it happens that something is preventing a connection to the port or hostname. Either there is a firewall blocking the connection or the process that is hosting the service is not listening on that specific port. This may be because it is not running at all or because it is listening on a different port. So, no connection can be established. Try running netstat -anb from the command line to see if there's anything listening on the port you were entered. If you get nothing, try changing your port number and see if that works for you. In Windows operating systems, you can use the netstat services via the command line (cmd.exe) . On Linux you may need to do netstat -anp instead. The target machine actively refused it occasionally , it is likely because the server has a full 'backlog' . Regardless of whether you can increase the server backlog , you do need retry logic in your client code, sometimes it cope with this issue; as even with a long backlog the server might be receiving lots of other requests on that port at that time.
  2. Detecting mobile device using user agent isn't the best way to check if a user is using a mobile device since user agent strings can be spoofed easily. There is a JavaScript API built-in for detecting media. The JavaScript window.matchMedia() method returns a MediaQueryList object representing the results of the specified CSS media query string. You can use this method to detect a mobile device based on the CSS media query. <script> $(document).ready(function(){ let isMobileDevice = window.matchMedia("only screen and (max-width: 760px)").matches; if(isMobileDevice){ // The viewport is less than 768 pixels wide //Conditional script here } else{ //The viewport is greater than 700 pixels wide alert("This is not a mobile device."); } }); </script> You can use above script to do show/hide elements depending on the screen size.
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