NetSuite sandbox suitetalk access

Hai all, I'm a new Netsuite and have completed Netsuite Functional Training. I am having trouble accessing the Sandbox environment through Suitetalk web services. I am using the 2016_2 WSDL. I have tried making use of the newest version WSDL, but this did not help.

I am using this on an existing test application, which now stopped working. I can still access the NetSuite production environment through Suitetalk. The error I receive: "The underlying connection was closed: An unexpected error occurred on a send."

The error occurs on any call made to the API. So far, I haven't seen anyone else online with a similar issue.

Any help will be appreciated, thank you in advance.

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