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Please note that Comodo CA is currently performing an unscheduled maintenance. According to this today, May 12, 2017, you can face some errors in placing of new orders on SSL, delays in processing orders and issuing certificates.

Punycode is a method for converting a domain name into an alternate format using only ASCII characters. For example, the URL "пример-сайта.рф" will have the following appearance in Punycode: "xn ---- 8sbarojrwjdmo.xn-p1ai." Most likely, you have already encountered such URLs.

Current CA / B Forum approved regulations state that certifying authorities must ensure that requests for SSL certificates received either from domain owners themselves or from those who is in charge of managing this domain. Generally, domain name verification done by creating a DNS TXT record with a specific value or by loading code to a specific location of the site. This confirms the fact of domain ownership.

In some cases, such as when SSL certificate not correctly installed on the server, following warning message will appear in the browser: an error has occurred while connecting to www.site.com. SSL received a weak ephemeral key Diffie-Hellman in the handshake message "Exchange keys server." (Error code: ssl_error_weak_server_ephemeral_dh_key).

Fraudsters attacked bank users by finding vulnerabilities in the security system of one of the largest Brazilian banks. Hackers were using Let's Encrypt certificates to create phishing website clones.