How common is it for CAs to issue end entity certificates with Extended Key Usage marked as critical?

Does anyone know whether it is common for CAs to issue end entity certificates, which can be used as client certs (possibly among other purposes), with the Extended Key Usage (EKU) extension marked as critical? I think that most CAs do not mark EKU as critical in the certs that they issue, but I would like to have my assumption confirmed.

Hostname/IP doesn’t match certificate’s altnames | Node & Nginx

Among several subdomains, I have node servers running on different ports. I have a subdomain called alexa-service.healform.de, which runs a node server that should execute some functions and requests. One function of this is a GET query of data provided by another subdomain, hosted on my server too – oauth2.healform.de. If I let this function run, I get the following error message in the terminal and that is also the curious part:

Error message:

Hostname / IP does not match certificate's altnames: "Host: localhost." Is not in the cert's altnames: DNS: ampinbaunatal.de, DNS: www.ampinbaunatal.de " 

When I saw that, I thought I was asking AskUbuntu rather than Stack. The domains ampinbaunatal.de and www.ampinbaunatal.de are also hosted on my server and also have a valid SSL certificate issued by Let’s Encrypt. But why does the function of oauth2.healform.de differ on ampinbaunatal.de? The domains have nothing to do with the function.

When I call the endpoint of the data, the function should retrieve, with Postman, I get a correct response. But as soon as I run the API query in localhost via the node server (I’m on Ubuntu Server 18.04 btw.), it somehow switches to the other domain and I get this error message.

Does anyone have an idea what’s wrong with the certificates? Both have valid SSL certificates. And why does he accidentally switch to the ampinbaunatal.de domain?


Nginx config for both servers:

server {   server_name oauth2.healform.de;   location / {     proxy_pass http://localhost:51001;     proxy_http_version 1.1;     proxy_set_header Upgrade $  http_upgrade;     proxy_set_header Connection 'upgrade';     proxy_set_header Host $  host;     proxy_cache_bypass $  http_upgrade;   }    listen 443 ssl; # managed by Certbot   ssl_certificate /path/to/fullchain.pem; # managed by Certbot   ssl_certificate_key /path/to/privkey.pem; # managed by Certbot   include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot   ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot }  server {   server_name alexa-services.healform.de;   location / {     proxy_pass http://localhost:51002;     proxy_http_version 1.1;     proxy_set_header Upgrade $  http_upgrade;     proxy_set_header Connection 'upgrade';     proxy_set_header Host $  host;     proxy_cache_bypass $  http_upgrade;   }    listen 443 ssl; # managed by Certbot   ssl_certificate /path/to/fullchain.pem; # managed by Certbot   ssl_certificate_key /path/to/privkey.pem; # managed by Certbot   include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot   ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot } 

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Is there a best practice for storing certificates (e.g. x509), which include private keys, used in unit tests?

In a software library, I wrote, large parts of the code use x509 certificates for various puprposes like signing documents digitally.

Is there a best practice for storing test certificates used for the unit tests? Should they be stored in git/the same versioning system where the code is?

Explanation of the authentication procedure when using signed certificates

I am using AWS IoT with X.509 self-signed certificates for authentication. To communicate with the cloud I use MQTT.

On my device side, I have a device certificate ( deviceCert.crt ) and the device certificate private key ( deviceCert.key ) , and also the root CA certificate from Amazon (root-CA.crt)

The device certificate is of course already registered on the AWS cloud.

I realize when using an MQTT client on the device that it requires the device to contain both the device certificate and the device private key during authentication.

Why isn’t the private key enough to have on the device? My guess was that the device would sign something with the device private key , and on the server end, it would use the public key from the device certificate (already stored there) to verify the signature.

Or does the device send the device certificate to the server and the server compares it with the one it has stored?

What happens exactly here?

No “Use system certificates” when trying to connect to WiFi

I am having a problem connecting to my university Eduroam WiFi.

If I understand correctly, in CA certificate I am supposed to select CA certificate if it is there or Use system certificate and input my university domain.

But, I only have: Select certificate or Don't validate. And if I click Select certificate, nothing is changing, there is not a Domain field appearing like I think it should (and where I could the domain name) (see screenshot).

enter image description here

Can you help?

Workflow Manager Auto Generated Certificates

I have SharePoint Farm with 2 Web front end servers, 2 application servers, and Database server. I have installed and configure Workflow manager on one of the application server with auto generated certificates.I have added one the certificate to SharePoint Server which host Central admin by going to the SharePoint Management shell and running the New-SPTrustedRootAuthority cmdlet.Do I have to add all four certificates from workflow manager server to all SharePoint servers in a farm? Please advise.

Thanks Ronak