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We close HTTP connections on our side after a fairly brief period, so the connections that your server is maintaining are not likely to us. Your HTTP connections need to be closed, so you'd need to go through the files (code) on your end to see where HTTP connections aren't being closed (usually this just looks like "foo.close()" in code, but you would be looking for a connection that is opened ("foo.open()") but never closed in your code.
Based on what you provided, you have 2 HTTP ports to connect through, but both are being used. Sorry there's no universal way I know of to close HTTP connections--that would depend on what your server configuration is and your code.
API Support Specialist
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A 403 response can be returned if the the non-SSL version of the request uri is used (i.e., http://... should be https://..), or if the resources being accessed are for an account other than the one authorized through your authentication process.
The link attribute you provided appears to be for the lists collection (the list of contact lists in the account), rather than a specific list, as well. Is the list creation where you're getting the 403 response?
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