Can't renew Let's Encrypt Server Certificates

    Hi,


    can't renew the Mail Server Certificates. Getting the following Error for several (not all) mail.xxx.xxx Domains:


    Failed authorization procedure. mail.xxx.xxx (http-01): urn:ietf:params:acme:error:dns :: DNS problem: NXDOMAIN looking up A for mail.xxx.xxx at /var/www/imscp/gui/plugins/LetsEncrypt/backend/LetsEncrypt.pm line 832

    We didn't made any changes the last 3 month (except adding new customers).

    Good morning,


    The error isn't clear enough? Look like there is a DNS problem (no DNS A record for mail.xxx.xxx). This can be either due to temporary error or you have done something wrong with your DNS configuration. Since you don't provide us with real domain name, we cannot check resolving.

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