SharePoint Web Service Exception - The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel

Resolution

Please refer the following article. this provide step by step guide to connect HTTPS Web Service with trusted root.

http://www.c-sharpcorner.com/uploadfile/anavijai/could-not-establish-trust-relationship-for-the-ssltls-secure-channel/

Please find another work around also.

http://stackoverflow.com/questions/1742938/how-to-solve-could-not-establish-trust-relationship-for-the-ssl-tls-secure-chan