How can I create a self-signed cert for localhost?

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I've gone through the steps detailed in How do you use https / SSL on localhost? but this sets up a self-signed cert for my machine name, and when browsing it via https://localhost I receive the IE warning.

Is there a way to create a self-signed cert for "localhost" to avoid this warning?

Although this post is post is tagged for Windows, it is relevant question on OS X that I have not seen answers for elsewhere. Here are steps to create a self-signed cert for localhost on OS X:

# Use 'localhost' for the 'Common name'
openssl req -x509 -sha256 -nodes -newkey rsa:2048 -days 365 -keyout localhost.key -out localhost.crt

# Add the cert to your keychain
open localhost.crt

In Keychain Access, double-click on this new localhost cert. Expand the arrow next to "Trust" and choose to "Always trust". Chrome and Safari should now trust this cert. For example, if you want to use this cert with node.js:

var options = {
    key: fs.readFileSync('/path/to/localhost.key').toString(),
    cert: fs.readFileSync('/path/to/localhost.crt').toString(),
    honorCipherOrder: true,
    secureProtocol: 'TLSv1_2_method'

var server = require('https').createServer(options, app);

Certificates for localhost - Let's Encrypt, It's possible to set up your own domain name that happens to resolve to , and get a certificate for it using the DNS challenge. However,  Making and trusting your own certificates. Anyone can make their own certificates without help from a CA. The only difference is that certificates you make yourself won’t be trusted by anyone else. For local development, that’s fine. The simplest way to generate a private key and self-signed certificate for localhost is with this openssl command:

You can use PowerShell to generate a self-signed certificate with the new-selfsignedcertificate cmdlet:

New-SelfSignedCertificate -DnsName "localhost" -CertStoreLocation "cert:\LocalMachine\My"

Note: makecert.exe is deprecated.

Cmdlet Reference:

How to Create a Self Signed Certificate in IIS 7, How do I create a self signed trusted certificate in Windows? The Browsers will still give you warnings about a self signed certificate that does not chain back to a trusted root. Tools like curl and wget will not complain, but you still need to trust you self signed with an option like cURL's --cafile. To overcome the Browser trust issue, you have to become your own CA.

After spending a good amount of time on this issue I found whenever I followed suggestions of using IIS to make a self signed certificate, I found that the Issued To and Issued by was not correct. SelfSSL.exe was the key to solving this problem. The following website not only provided a step by step approach to making self signed certificates, but also solved the Issued To and Issued by problem. Here is the best solution I found for making self signed certificates. If you'd prefer to see the same tutorial in video form click here.

A sample use of SelfSSL would look something like the following:

SelfSSL / /V:1000 /S:2

SelfSSL /? will provide a list of parameters with explanation.

Install a Self-Signed Certificate on a Windows Computer, Do not use self-signed certificates in production ! For online certificates, use Let's Encrypt instead (tutorial). Certificate authority (CA). Generate RootCA.pem  There are alot of tutorials online on how to create a self-signed certificate. Most encourage you to use openssl and you can use Heroku's very thorough tutorial on how to do that. Then when with your generated certs, you can refer to them through your web server setup (as seen in the code block above).

Since this question is tagged with IIS and I can't find a good answer on how to get a trusted certificate I will give my 2 cents about it:

First use the command from @AuriRahimzadeh in PowerShell as administrator:

New-SelfSignedCertificate -DnsName "localhost" -CertStoreLocation "cert:\LocalMachine\My"

This is good but the certificate is not trusted and will result in the following error. It is because it is not installed in Trusted Root Certification Authorities.

Solve this by starting mmc.exe.

Then go to:

File -> Add or Remove Snap-ins -> Certificates -> Add -> Computer account -> Local computer

Expand the Personal folder and you will see your localhost certificate:

Copy this into Trusted Root Certification Authorities - Certificates

The final step is to open Internet Information Services (IIS) Manager or simply inetmgr.exe. From there go to your site, select Bindings... and Add... or Edit.... Set https and select your certificate from the drop down.

Your certificate is now trusted:

How to create an HTTPS certificate for localhost domains · GitHub, The solution. Step 1: Root SSL certificate. The first step is to create a Root Secure Sockets Layer (SSL) certificate. Step 2: Trust the root SSL certificate. Before you can use the newly created Root SSL certificate to start issuing domain certificates, there's one more step. Step 2: Domain SSL certificate. To be able to serve a site on HTTPS from localhost you need to create a self-signed certificate. A self-signed certificate is sufficent to establish a secure, HTTPS connection for development purposes. Although browsers will complain that the certificate is self-signed (and as such is not trusted).

If you are trying to create a self signed certificate that lets you go http://localhost/mysite Then here is a way to create it

makecert -r -n "CN=localhost" -b 01/01/2000 -e 01/01/2099 -eku -sv localhost.pvk localhost.cer
cert2spc localhost.cer localhost.spc
pvk2pfx -pvk localhost.pvk -spc localhost.spc -pfx localhost.pfx


How to get HTTPS working on your local development environment , This will create a self-signed certificate valid for a year with a private key. It is only for “localhost”. 6. Pluralsight. Yes, they are a training company but they also have​  Once the certificate is created, you should be able to go into IIS and create an HTTPS binding for your site. Find your website on IIS. Click Bindings… on the menu on the right. Click Add…. In the Add Site Binding box, set Type to “https” and your newly-created certificate should be available in the SSL certificate dropdown.

Generating self-signed certificates on Windows, This weekend I was tasked with building a login system using passport.js's facebook strategy. Sure it Tagged with javascript, webdev. IT: How To Create a Self Signed Security (SSL) Certificate and Deploy it to Client Machines Jason Faulkner Updated July 12, 2017, 3:45pm EDT Developers and IT administrators have, no doubt, the need the deploy some website through HTTPS using an SSL certificate.

2 Minute Self Signed SSL Certificate for localhost, Leave 'Identity Type' as 'Self Signed Root'; Change 'Certificate Type' to 'SSL Server'. an image. Then hit 'Create'. OS X will tell you that a  To run it on a personal system and without a domain name, you will need to generate a self-signed SSL certificate and then run the regular command to start the node but replace the domain name with localhost, key with the generated key, and cert with the generated cert. sh create-alias gateway-identity-passphrase Generating a self-signed cert

never see localhost SSL warnings again, We set a custom domain name to our localhost website as Now, we want to create a self-signed SSL certificate and  Is it possible to create a self-signed cert for https://localhost so that the user doesn't need to then trust the certificate every time they log on to the computer. I have tried creating the self-signed cert and adding it to the trusted authority list but I still need to browse

  • Did you install the certificate as a CA?
  • I followed the process to install a self-signed cert into IIS under Win7. But that creates the cert for "mymachinename", and I need one for "localhost".
  • Hi! Consider setting Auri's answer as the main answer as makecert is deprecated. Link to the answer:
  • The first command, ssh-keygen, is unnecessary as the openssl command is also creating a new key (and overwriting the one created by ssh).
  • Also you can automate the process completely by adding -subj '/CN=localhost' to the openssl arguments.
  • To have OS X trust it from the command line instead of clicking around, you can do: sudo security add-trusted-cert -p ssl -d -r trustRoot -k ~/Library/Keychains/login.keychain localhost.crt
  • Also relevant for linux. Thanks a lot.
  • I followed all these steps and I'm getting a ERR_SSL_VERSION_OR_CIPHER_MISMATCH in Chrome 60 and Safari 10.1.2 doesn't like it either.
  • This should be the answer as of 2017.
  • For those who follow and don't know how to go about installing the resultant cert, follow the steps in this video, it worked for me!
  • where do the key and crt files get stored?
  • @woojoo666 with -KeyLocation flag you can specify location.