Letsencrypt dosen't recogonize my domain name - dns

letsencrypt dosen't recogonize my domain name and it throws the below error while running docker-compose from the below link
https://github.com/linuxserver/docker-swag
To fix these errors, please make sure that your domain name was
entered correctly and the DNS A/AAAA record(s) for that domain
contain(s) the right IP address.
ERROR: Cert does not exist! Please see the validation error above. The issue may be due to incorrect dns or port forwarding settings. Please fix your settings and recreate the container

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localtest.me’s server IP address could not be found

I've attempted to set up a test binding through IIS to localtest.me, but it's not resolving to my local IP address. My understanding of localtest.me is that it should resolve automatically. In Chrome is get the error message:
blog-test.localtest.me’s server IP address could not be found.
And when pinging blog-test.localtest.me I get the following error:
Ping request could not find host blog-test.localtest.me. Please check the name and try again.
In IIS I have a site that's bound to blog-test.localtest.me with the following settings:
Everything I've read online advises that localtest.me should resolve automatically? Is this the case or is there setup step I'm missing?
You can simply add this entry in your host file locally, and it will work.
On windows machine - C:\Windows\System32\drivers\etc\hosts
On *nix machine - /etc/hosts
It sounds like you didn't register the domain in either DNS or hosts file.
1.So if you are in an AD environment, please add a CNAME blog-test.localtest.me in your local DNS Forward lookup zone.
2.If you are going to access the website from public domain, then please purchase the domian from domain provider and point it to Server's public IP.
3.If you just want to access the website locally, please add the domain to hosts file.
The hosts record would looks like:
127.0.0.1 blog-test.localtest.me

Remote Access Setup: The subject name of the network location server certificate does not resolve correctly

Doing a quick setup of DirectAccess on Server2k19.
One nic card, NAT'd behind a firewall.
Server is PDC and will act as all parts of DirectAccess (RAS, NLS, and Application Server).
In the Remote Access Setup, everything is configured but when trying to Finish and apply, its giving me "The subject name of the network location server certificate does not resolve correctly. Ensure that the name resolves to the IP address of the internal network adapter of the server".
Domain Forest is acme.local and the Network location server is set to use a self-signed certificate, which defaults to:
S=Texas, C=USA, O=Dell Inc., L=Round Rock, CN=SERVER.acme.local
The DNS Forward Lookup zone has a record for SERVER as SERVER.acme.local. and points to the internal local IP of the server 192.168.0.8
Ive also added the same A records in DNS for : directaccess-webprobehost and directaccess-corpconnectivityhost -- both pointing to the same 192.168.0.8 IP
What am I doing wrong? I'll answer any questions promptly if there's more to drill down to. Thanks in advance.
Just try to update the group policy by the following command and then try it's working.
gpupdate /force

What am I missing: Intergrating custom domain with heroku app + cloudflare not working

I'm trying to connect my herokuapp to my custom domain, and I'm having tons of problems, I'm stuck at this error Error 525.
I generated an SSL certificate with Cloudflare and installed the certificate, but I still get this error.
My site points to the cloudflare IP address, but I need to to point to my herokuapp
Can someone please help ? Here's my cloudflare details:

NameServer do not forward

i bought a domain at networksolutions and try to forward dns to my vps, the problem is, its not forward when i try to open page, ie gave me that error.
i also use the plesk panel
ERROR
The requested URL could not be retrieved
The following error was encountered while trying to retrieve the URL:
http://ertugoto.com/
Unable to determine IP address from host name ertugoto.com
The DNS server returned:
Server Failure: The name server was unable to process this query. This
means that the system was not able to resolve the hostname presented
in the URL. Check if the address is correct.
It appears that you do not have DNS name servers configured for that domain. At least the DNS roots do not know about them. You will need to work with network solutions to have them add glue records for your name servers, or if they are hosting the DNS for you then you need to add the NS records etc for your domain.

New domain - Can ping Netbios and IP, but not FQDN (errors joining name)

I am having issues with my DNS. I am setting up a new domain and have Windows Server 2008 R2. The domain controller is running on Hyper-V. Of course I can ping the FQDN internally on the Domain controller but not the host server.
When pinging the Netbios name from host the DNS resolves and ping is successful. When pinging using using FQDN (server1.contoso.local) I receive Ping request could not find host server1.contoso.local. Please check the name and try again.
I have done nothing to the network besides setting up the Active Directory. IP6 is disabled. The server and DC have static IPs and my router is the DHCP provider. The DC is DNS.
setup is as follows:
IP: 192.168.0.199
Subnet: 255.255.255.0
Default gateway: 192.168.0.1 (router internal IP)
Preferred DNS: 192.168.0.100 (DC IP)
Alternate: 192.168.0.1
When I attempt to join the domain I have to use the Netbios name (FQDN will not work; could not contact active directory domain controller). I am prompted to enter domain password but then receive the following error: "The following error occurred attempting to join the domain "domain-name" An attempt to resolve the dns name of a domain controller in the domain being joined has failed. Please verify this client is configured to reach a DNS server that can resolve DNS names in the target domain."
I have disabled the firewal on both the host server and the DC. I have attempted a /flushdns and a /registerdns. No changes. When attempting to renew the ipconfig on the DC I receive the following error: "An error occurred while releasing interface Loopback Pseudo-Interface 1: the system cannot find the file specified"
Is my problem simply a missing DNS entry? I unfortunately do not know much about DNS.
Thank you in advance.
I was able to resolve this issue on my end by adding the domain name suffix to the host's NIC.
I actually just resolved my issue. One key bit of information I completely forgot to mention was that I have 2 NICs installed and in use on my server. One of them is assigned strictly to the VM Domain Controller. Because of this a virtual network connection was created. For some reason that I don't entirely understand this was affecting my ability to see the FQDN on my network. I corrected the DNS settings on the virtual NIC and all my NETBIOS woes have left.
I don't really understand why that caused the problem, but changing the virtual NIC DNS server settings which defaulted to my router instead of my DC fixed the problem.

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