Let's Encrypt - Nameserver malfunctioning?

Ubuntu Linux 20.04.2
Virtualmin 6.16 Pro

I have 60 Domains on my server all DNS are configured “the same way”. But I cant renew or request a new certificate for the Domain js-networking.com. Server IP is 217.160.215.158

DNS seems to be okay. I setup a new server wih Debian 10 and I hadn’t problems getting e cert.
Getting back to Ubuntu the problem is back again:

Validating configuration for js-networking.com
… no problems found

Requesting a certificate for js-networking.com, www.js-networking.com, mail.js-networking.com, admin.js-networking.com, webmail.js-networking.com from Let’s Encrypt …
… request failed : Web-based validation failed :

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator webroot, Installer None
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for admin.js-networking.com
http-01 challenge for js-networking.com
http-01 challenge for mail.js-networking.com
http-01 challenge for webmail.js-networking.com
http-01 challenge for www.js-networking.com
Using the webroot path /home/js-networking.com/public_html for all unmatched domains.
Waiting for verification…
Challenge failed for domain admin.js-networking.com
Challenge failed for domain js-networking.com
Challenge failed for domain mail.js-networking.com
Challenge failed for domain webmail.js-networking.com
Challenge failed for domain www.js-networking.com
http-01 challenge for admin.js-networking.com
http-01 challenge for js-networking.com
http-01 challenge for mail.js-networking.com
http-01 challenge for webmail.js-networking.com
http-01 challenge for www.js-networking.com
Cleaning up challenges
Some challenges have failed.
IMPORTANT NOTES:

DNS-based validation failed :

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator manual, Installer None
Obtaining a new certificate
Performing the following challenges:
dns-01 challenge for admin.js-networking.com
dns-01 challenge for js-networking.com
dns-01 challenge for mail.js-networking.com
dns-01 challenge for webmail.js-networking.com
dns-01 challenge for www.js-networking.com
Running manual-auth-hook command: /etc/webmin/webmin/letsencrypt-dns.pl
Running manual-auth-hook command: /etc/webmin/webmin/letsencrypt-dns.pl
Running manual-auth-hook command: /etc/webmin/webmin/letsencrypt-dns.pl
Running manual-auth-hook command: /etc/webmin/webmin/letsencrypt-dns.pl
Running manual-auth-hook command: /etc/webmin/webmin/letsencrypt-dns.pl
Waiting for verification…
Challenge failed for domain admin.js-networking.com
Challenge failed for domain js-networking.com
Challenge failed for domain mail.js-networking.com
Challenge failed for domain webmail.js-networking.com
Challenge failed for domain www.js-networking.com
dns-01 challenge for admin.js-networking.com
dns-01 challenge for js-networking.com
dns-01 challenge for mail.js-networking.com
dns-01 challenge for webmail.js-networking.com
dns-01 challenge for www.js-networking.com
Cleaning up challenges
Running manual-cleanup-hook command: /etc/webmin/webmin/letsencrypt-cleanup.pl
Running manual-cleanup-hook command: /etc/webmin/webmin/letsencrypt-cleanup.pl
Running manual-cleanup-hook command: /etc/webmin/webmin/letsencrypt-cleanup.pl
Running manual-cleanup-hook command: /etc/webmin/webmin/letsencrypt-cleanup.pl
Running manual-cleanup-hook command: /etc/webmin/webmin/letsencrypt-cleanup.pl
Some challenges have failed.
IMPORTANT NOTES:

  • The following errors were reported by the server:

    Domain: admin.js-networking.com
    Type: dns
    Detail: DNS problem: SERVFAIL looking up TXT for
    _acme-challenge.admin.js-networking.com - the domain’s nameservers
    may be malfunctioning

    Domain: js-networking.com
    Type: dns
    Detail: DNS problem: SERVFAIL looking up TXT for
    _acme-challenge.js-networking.com - the domain’s nameservers may be
    malfunctioning

    Domain: mail.js-networking.com
    Type: dns
    Detail: DNS problem: SERVFAIL looking up TXT for
    _acme-challenge.mail.js-networking.com - the domain’s nameservers
    may be malfunctioning

    Domain: webmail.js-networking.com
    Type: dns
    Detail: DNS problem: SERVFAIL looking up TXT for
    _acme-challenge.webmail.js-networking.com - the domain’s
    nameservers may be malfunctioning

    Domain: www.js-networking.com
    Type: dns
    Detail: DNS problem: SERVFAIL looking up TXT for
    _acme-challenge.www.js-networking.com - the domain’s nameservers
    may be malfunctioning

Can somebody help me. i don’t know how to to solve it. Already tried a lot.
Thanks in advance.

From my end I also get servfail when checking your domain, however checking DNS Propagation Test for js-networking.com - Explore the results it seems that from some locations it’s reachable.
Maybe contact your provider and ask for some assistance, maybe they are having some routing issues at the moment?