Unable to add Web Reference in C#

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C#

C#4.0

I am using Visual Studio 2010 and when I am trying to add add web reference to the https://servicesName

then I am receiving below error:

There was an error downloading 'https://servicesName'.
The request failed with the error message:
--
<?xml version='1.0' ?>
<env:Envelope xmlns:env='http://schemas.xmlsoap.org/soap/envelope/'>
<env:Body>
<env:Fault>
<faultcode>env:Client</faultcode>
<faultstring>Internal Error</faultstring>
</env:Fault>
</env:Body>
</env:Envelope>

--.
Metadata contains a reference that cannot be resolved: 'https://servicesName'.
Metadata contains a reference that cannot be resolved: 'https://servicesName'.
If the service is defined in the current solution, try building the solution and adding the service reference again.

I have also install the certificate given by service developer, on my computer.
I am using Windows Operating system.

Service developer is saying that to make SSL connection client needs to load certificate to "Truststore".

I have added certificate to "TRUSTED PEOPLE" but I am unable to add reference to the service.


Please, can anyone tell me what wrong I am doing?