Can't establish SSL connection to web service C# -

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i'm trying connect web-service. i'm new ssl stuff. here's code: 

public void sendrequest(string httpsurl, string postdata, string[] certificates, string password) { httpwebrequest request = (httpwebrequest)webrequest.create(httpsurl);  request.method = "post";  byte[] bytearray = encoding.utf8.getbytes(postdata); request.contenttype = "application/x-www-form-urlencoded"; request.contentlength = bytearray.length;   x509certificate certificate = null; foreach (string cert in certificates) {     certificate = new x509certificate(cert, password);     request.clientcertificates.add(certificate); //add cert }  stream datastream = request.getrequeststream(); datastream.write(bytearray, 0, bytearray.length); datastream.close(); }

the request.getrequeststream() throws exception: "the underlying connection closed: not establish trust relationship ssl/tls secure channel".

certificates given me web service provider (.cer files), password (key.dat), think might private key.

any ideas why throws error? doing wrong?


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