Skip to main content
Share Your Experience: Take the 2024 Developer Survey
39 votes

Is there an example domain which is guaranteed not to exist?

As per RFC 6761 section 6.4, the domain invalid. and any names falling within .invalid., can be assumed not to exist.
a3nm's user avatar
  • 919
29 votes
Accepted

Spam emails regarding Domain Abuse Notices

This is spam at the least - at worst, it's a scam. Do not agree to send a read receipt. Do not download unnecessary content. Do not click links. Do not reply. Do not pass Go... etc. As others have ...
ArtOfCode's user avatar
  • 410
26 votes
Accepted

List of top-level domains (TLDs) that require HTTPS connections, like .dev

A direct answer to this would eventually become outdated if more top-level domains start enforcing HTTPS using HTTP Strict Transport Security (HSTS, RFC 6797). Technically this is an HSTS policy of a ...
Esa Jokinen's user avatar
  • 50.1k
18 votes

Spam emails regarding Domain Abuse Notices

This is some attempt to spam/phish/infect with malware. Just delete it and carry on. There is no real way to avoid this crap, but you have your full contact information including mail in the domain ...
Sven's user avatar
  • 99.6k
15 votes

Relation between "Registrar Registration Expiration Date" and the actual expiry

You hit probably one of the worst corner case of domain names, one that is often poorly explained everywhere and that causes a lot of problems. The following applies to gTLDs (some ccTLDs may work the ...
Patrick Mevzek's user avatar
12 votes
Accepted

How to handle domains whose names shouldn't be published by certificate transparency?

I have a set of domain names that are used internally For internal only uses, you can set a private CA, install its certificate on internal systems, and issue internal certificates yourself. If your ...
ThoriumBR's user avatar
  • 5,332
11 votes

Domain will not propagate (Over 96+ Hours)

I'm basically parroting Michael here, but this is too much to paste into a comment: ;sai.ngo. IN A ngo. 172800 IN NS b0.nic.ngo. ngo. ...
Andrew B's user avatar
  • 33.2k
9 votes

Spam emails regarding Domain Abuse Notices

If you go to mxtoolbox, and check your domain for blacklisting, it doesn't return as listed on any at this time. You can check for blacklisting on: http://mxtoolbox.com/blacklists.aspx If you check ...
ralz's user avatar
  • 2,781
7 votes

How to set the domain name on GNU/Linux?

man hostname, being cited from its end to beginning FILES /etc/hostname Historically this file was supposed to only contain the hostname and not the full canonical FQDN. Nowadays most ...
poige's user avatar
  • 9,595
7 votes

How to map a domain name to a load balancer in google cloud platform?

It seems to take time for gcp to know how to handle the new domain name. About some 15 minutes after the additional of the new A record, the domain name www.mycompany.com starts to work. The 404 ...
Anthony Kong's user avatar
  • 3,498
7 votes

CNAME working - but not for directories

It's not DNS CNAME problem. DNS only help clients to resolve IP from FQDN. If virtual host root works, then IP resolving works fine. You need to check you web server configuration, and web server ...
Slipeer's user avatar
  • 3,313
6 votes

How to handle domains whose names shouldn't be published by certificate transparency?

If leaking host names is part of your threat model, then CT is probably not the only source of such leakage. Think of email headers, logs, monitoring, compilers, .. lots of tools could eventually ...
anx's user avatar
  • 9,822
6 votes
Accepted

How to plan an Active Directory domain rename without it killing me?

If your organization changes and you need an entirely new directory structure, sure take the opportunity to pick a best practice DNS name. But you have not identified a problem, either technical or ...
John Mahowald's user avatar
6 votes
Accepted

How to responsibly discontinue receiving email at an old Internet domain?

As is noted already in the question, there is a conflict between the desire of not accepting incoming email and the idea of being able to contact the domain owner via email by convention-based email ...
Håkan Lindqvist's user avatar
5 votes

Do I have to specify new added domain in /etc/host?

The question, is simple : do I have to add an entry in my /etc/host file for that new added domain No.
user9517's user avatar
  • 116k
5 votes
Accepted

Do I have to specify new added domain in /etc/host?

To expand on Iain's correct answer, in normal circumstances you rely on DNS and don't need anything in /etc/hosts and you certainly don't need to add each and every DNS entry and domain that points to ...
HBruijn's user avatar
  • 80.7k
5 votes

Domain blocked my domain for whois invalid data

According to the email you received, the abuse team at Name.com received a WDPR (Whois Data Problem Report) that was submitted through ICANN. These reports are used to identify incomplete or ...
Ruscal's user avatar
  • 1,222
5 votes
Accepted

Computers unjoin domain after each reboot

No, your computers are not unjoining the domain i.e. disappearing from your Active Directory. The problem here is related to your DNS configuration, alone. I believe that ipconfig /all shows: ...
Esa Jokinen's user avatar
  • 50.1k
5 votes
Accepted

Getting the "fully qualified canonical domain name" in Linux server

hostname -f (or --fqdn or --long) should return the fully qualified domain name.
sippybear's user avatar
  • 3,287
5 votes

Is email deliverability impossible with a .name email address?

Sadly, @MichaelHampton may be right. All evidence seems to confirm that .name email addresses from third level domain registrations are broken and unusable for outbound email. I emailed with ICANN and ...
ryan's user avatar
  • 291
5 votes

List of top-level domains (TLDs) that require HTTPS connections, like .dev

This was generated using the procedure in Esa Jokinen's answer, but it seemed like it might be useful to have a literal list, even if it does need to be updated periodically. HSTS Preloaded TLDs ...
5 votes

Move domain without affecting email service

From the sound of it, you're not moving the domain, you're setting up a website for the domain. Create the appropriate DNS records for the website and leave all the other DNS records alone. Also, I ...
joeqwerty's user avatar
  • 111k
4 votes

When exim4 sends HELO/EHLO, how do I configure which host name it sends?

Which hostname is exim sending ? One can find the HELO name in exim4's logs. Stop the exim4 daemon, then restart it manually with debugging enabled : /usr/sbin/exim4 -bd -d+all 2>&1 | egrep '...
Skippy le Grand Gourou's user avatar
4 votes

How to set domainname in RHEL7.3 machine

Are you sure you want the domainname and not hostname or hostname -d? The domainname is used on hosts with NIS(YP). If you want to set just the hostname in FQDN form, use following command: ...
Jaroslav Kucera's user avatar
4 votes

How to handle domains whose names shouldn't be published by certificate transparency?

This seems like a pretty simple decision unless I'm missing something. If you decide the privacy of the data that would be exposed via Certificate Transparency to be more valuable than the ...
Ryan Bolger's user avatar
  • 16.9k
4 votes
Accepted

ICANN Domain Grace Period for expired domains

Does that mean that I have 30 days to recover my domain? Absolutely not. What you quote (redemption grace period) is what happens after a domain is deleted not after it expires, because in fact at ...
Patrick Mevzek's user avatar
4 votes
Accepted

Does the Glue record get cached by the Recursive resolver?

Normally, the glue records aren't given as authoritative answers, which you may notice, if you look at the flags (the existence or absence of aa Authoritative Answer; RFC 1035, 4.1.1) e.g. of the ...
Esa Jokinen's user avatar
  • 50.1k
3 votes

WHOIS command not returning useful information?

You're asking for all record types, rather than just domain records. From whois help By default, WHOIS performs a very broad search, looking in all record types for matches to your query in these ...
mikemaccana's user avatar
  • 3,520
3 votes

How would I go about getting a domain like lu.re?

Unfortunately, two-character .re domains must be one number and one letter, or two numbers. Accurate as of November 2016. As of 6 Dec 2011, .re was opened to registration by anyone in the world, but ...
i336_'s user avatar
  • 184
3 votes

Nginx server host header server_name

When you type http://myserver/ in your browser, you will ask the DNS server to resolve name myserver to IP address. Then, the browser will connect to one of the returned IP address(es). The name ...
Khaled's user avatar
  • 37k

Only top scored, non community-wiki answers of a minimum length are eligible