My link shortener app has an SSL issue

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1

Hello, I’m hosting a link shortener on Heroku. I have a Flask app and a Telegram bot codes there. But the domains I use for shortened links are added here to Cloudflare. A few days ago I noticed that bot shows an error when I try to shorten a link. As I see it is related to certificates or domains, I don’t know for sure:

Error: [SSL: TLSV1_UNRECOGNIZED_NAME] tlsv1 unrecognized name (_ssl.c:1006)

I didn’t change any settings for like 6 monts on Heroku and Cloudflare (until few days ago, because I tried to fix it. But, it still doesn’t work).

What might be the cause of the problem?

2
  1. What domain(s)?
  1. How exactly did you try to fix it?
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