System.Net.Sockets.SocketException (0x80004005)

A SocketException is an exception that is raised by the Socket and Dns classes when an error occurs in the network communication process. These exceptions typically occur as a result of connectivity issues arising from variances in IP protocols (such as IPV4/IPV6) between the communicating servers or computers. Additionally, they can be triggered by additional authentication rules configured on one of the machines, impacting inbound or outbound connectivity.

SocketExceptions provide valuable information regarding network-related errors, allowing developers to diagnose and troubleshoot connectivity problems effectively. By examining the specific details provided in the exception, such as error codes or error messages, developers can gain insights into the underlying causes of the network issues and take appropriate actions to resolve them.

Cannot connect System.Net.Sockets.SocketException (0x80004005)

When encountering a SocketException, it is crucial to thoroughly analyze the exception details and consider factors like IP protocol compatibility, firewall settings, and authentication requirements. By addressing these issues, it is possible to establish smooth and reliable network communication between the involved servers or computers.

Ways to troubleshoot the issue are, check you have proper internet connection is there on your machine or not, and you are able to ping the remote server or not. Possible causes for the error:

  1. You are using the wrong IP address.
  2. You are using the wrong port.
  3. Firewall blocking the connection.

Third-party application

This SocketException means that the remote side closed the connection (usually by sending a TCP/IP RST packet ). If you're working with a third-party application, the likely causes are:

  1. You are sending malformed data to the application (which could include sending an HTTPS request to an HTTP server).

  2. The network link between the client and server is going down for some reason.

  3. You have triggered a bug in the third-party application that caused it to crash.

  4. The third-party application has exhausted system resources.

It's likely that the first case is what's happening.


In some cases, if you try using the IP, it might work.


Handling SocketExceptions in a comprehensive manner ensures robust network connectivity and supports uninterrupted data exchange, contributing to the overall reliability and performance of the application.