オーナーズストアの利用マニュアル通り設定は済んでいます。
認証キーも設定完了しています。
「購入商品一覧を取得する」ボタンをクリックすると
「配信サーバーへ接続できません。」というエラーが出てきます。

購入商品一覧のページは以下の文字が表示されます。

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The page cannot be found
The page you are looking for might have been removed, had its name changed, or is temporarily unavailable.

Please try the following:

Make sure that the Web site address displayed in the address bar of your browser is spelled and formatted correctly.
If you reached this page by clicking a link, contact the Web site administrator to alert them that the link is incorrectly formatted.
Click the Back button to try another link.

HTTP Error 404 - File or directory not found.
Internet Information Services (IIS)

Technical Information (for support personnel)

Go to Microsoft Product Support Services and perform a title search for the words HTTP and 404.
Open IIS Help, which is accessible in IIS Manager (inetmgr), and search for topics titled Web Site Setup, Common Administrative Tasks, and About Custom Error Messages.
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お手数ですが、ご確認ほどよろしくお願いします。