Client certificate for ComSignTrust

[dilipkumbhar]

I want to integrate digital signature on the report of AR invoice. PDF file of AR invoice is generated first and then digital sign will be printed at the bottom. I am using ComSignTrust for this application. Dll is not provided by ComSignTrust. I am using WSDL . When I am adding the Service reference of https://online-dev.comsigntrust.com/signature/signature.svc?wsdl , I am getting error as,

There was an error downloading 'https://online-dev.comsigntrust.com/signature/signature.svc?wsdl/_vti_bin/ListData.svc/$metadata'.
The request was aborted: Could not create SSL/TLS secure channel.
Metadata contains a reference that cannot be resolved: 'https://online-dev.comsigntrust.com/signature/signature.svc?wsdl'.
Could not establish secure channel for SSL/TLS with authority 'online-dev.comsigntrust.com'.
The request was aborted: Could not create SSL/TLS secure channel.
If the service is defined in the current solution, try building the solution and adding the service reference again.

So I changed the method. I used SOAP for generating the signature.  There I got error as,

The request was aborted.Could not create SSL/TLS secure channel.

Both the methods gave me the same error. I have not installed the client certificate on the PC. Is it needed ? Will it fix the problem if client certificate is installed ?