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HTTP/1.1 301 Moved Permanently
Server: nginx/1.28.0
Date: Thu, 29 Jan 2026 17:20:23 GMT
Content-Type: text/html
Content-Length: 169
Location: https://test.mosquitto.org/ssl/
Connection: keep-alive
Expires: Sat, 31 Jan 2026 17:20:23 GMT
Cache-Control: max-age=172800
Cache-Control: max-age=172800
Strict-Transport-Security: max-age=31536000;includeSubDomains
X-Frame-Options: DENY
Content-Security-Policy: default-src 'none'; script-src 'self' 'unsafe-inline'; connect-src 'self' ws://test.mosquitto.org:8080/mqtt wss://test.mosquitto.org:8081/mqtt; img-src 'self' www.paypal.com www.paypalobjects.com; style-src 'self' 'unsafe-inline'; base-uri 'self';form-action 'self' https://www.paypal.com/donate; frame-src 'self' github.com;
X-Content-Type-Options: nosniff
Referrer-Policy: no-referrer-when-downgrade
Permissions-Policy: geolocation=() midi=() notifications=() push=() sync-xhr=() microphone=() camera=() magnetometer=() gyroscope=() speaker=() vibrate=() fullscreen=(self) payment=()
HTTP/1.1 200 OK
Server: nginx/1.28.0
Date: Thu, 29 Jan 2026 17:20:23 GMT
Content-Type: text/html; charset=UTF-8
Transfer-Encoding: chunked
Connection: keep-alive
X-Powered-By: PHP/8.1.33
Content-Encoding: gzip
Generate client certificates for test.mosquitto.org
Generate a TLS client certificate for test.mosquitto.org
This page allows you to generate an x509 certificate suitable that will allow you to connect to the TLS enabled ports on test.mosquitto.org that require a client certificate, i.e. port 8884.
To use it, you will need to generate a PEM encoded Certificate Signing Request (CSR) and paste it into the form. After you submit the form, the certificate will be generated for you to download. The certificates are valid for 90 days.
Generate a CSR using the openssl utility
Generate a private key:
- openssl genrsa -out client.key
Generate the CSR:
- openssl req -out client.csr -key client.key -new
When you are generating the CSR, please do not use the default values. At a minimum, the CSR must include the Country, Organisation and Common Name fields.
You should paste the contents of client.csr into the form.
Using the certificate
You need to give your client the CA certificate and both your client certificate and key. For mosquitto_sub use something like:- mosquitto_sub -h test.mosquitto.org -p 8884 -t '$SYS/#' -v --cafile mosquitto.org.crt --cert client.crt --key client.key
Paste your CSR here