常時SSL化 RSSフィードが表示されない

RewriteEngine on
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://www.〇〇〇.com/$1 [R=301,L]

.htaccessに上記のように書き込み常時SSL化をしたところ、今までRSSが表示されていた部分に
「There was a problem contacting your RSS feed server.https://www.〇〇〇.com/blog/log/index.rdf?feed=rss2&cid=10」
と出てRSSが表示されなくなってしまいました。

■使用しているRSSリーダー
https://feed.mikle.com/
■読み込んでいるブログ
Serene bach
■RSSリーダーのコード

html
1<!-- start feedwind code -->
2<script type="text/javascript">document.write('\x3Cscript type="text/javascript" src="' + ('https:' == document.location.protocol ? 'https://' : 'http://') + 'feed.mikle.com/js/rssmikle.js">\x3C/script>');</script>
3<script type="text/javascript">(function() {var params = {rssmikle_url: "https://www.〇〇〇.com/blog/log/index.rdf?feed=rss2&cid=10",rssmikle_frame_width: "510",rssmikle_frame_height: "520",frame_height_by_article: "5",rssmikle_target: "_blank",rssmikle_font: "'メイリオ','ＭＳ Ｐゴシック',sans-serif",rssmikle_font_size: "12",rssmikle_border: "off",responsive: "off",rssmikle_css_url: "",text_align: "left",text_align2: "left",corner: "off",scrollbar: "off",autoscroll: "off",scrolldirection: "up",scrollstep: "3",mcspeed: "20",sort: "Off",rssmikle_title: "off",rssmikle_title_sentence: "",rssmikle_title_link: "",rssmikle_title_bgcolor: "#9ACD32",rssmikle_title_color: "#FFFFFF",rssmikle_title_bgimage: "",rssmikle_item_bgcolor: "#FFFFFF",rssmikle_item_bgimage: "",rssmikle_item_title_length: "55",rssmikle_item_title_color: "#666666",rssmikle_item_border_bottom: "on",rssmikle_item_description: "title_only",item_link: "off",rssmikle_item_description_length: "150",rssmikle_item_description_color: "#666666",rssmikle_item_date: "gl1",rssmikle_timezone: "Etc/GMT",datetime_format: "%Y/%m/%d",item_description_style: "text",item_thumbnail: "full",item_thumbnail_selection: "auto",article_num: "15",rssmikle_item_podcast: "off",keyword_inc: "",keyword_exc: ""};feedwind_show_widget_iframe(params);})();</script>
4<div style="font-size:10px; text-align:center; width:510px;"><a href="https://feed.mikle.com/" target="_blank" style="color:#CCCCCC;">RSS Feed Widget</a>
5<!--Please display the above link in your web page according to Terms of Service.-->
6</div>
7<!--  end  feedwind code -->