WCF Web Service as Window Service hosted in server and need to consume

The error you're encountering ("Could not establish trust relationship for the SSL/TLS secure channel") indicates that the client application doesn't trust the SSL certificate presented by the server when establishing the secure connection. To resolve this issue, here are steps you can take:

Install SSL Certificate on the Client Side

1. Export the SSL Certificate from the Server:

   • Export the SSL certificate from the server where your WCF service is hosted.
   • Ensure you export the full chain if it's a chained SSL certificate.

2. Install the SSL Certificate on the Client Machine:

   • Import the SSL certificate into the Trusted Root Certification Authorities store on the client machine.
   • You can do this via the Windows Certificate Manager (certmgr.msc) or programmatically.

Hi Tuhin Paul,

Thanks !! Installed the Root CA Certificate in my Client machine , problem is solved. 

To ignore SSL errors in .NET, you can add the following code to your client application:

ServicePointManager.ServerCertificateValidationCallback = 
    (sender, cert, chain, errors) => true;

This will cause the client to accept any SSL certificate presented by the service, regardless of its validity.

The error message you're seeing indicates that the SSL certificate presented by the WCF service is not trusted by the client application. This could happen if the certificate is not issued by a trusted root CA or if the hostname on the certificate does not match the hostname used to access the service.