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Editorial Team
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Asked: 2026-05-25T00:53:47+00:00

I am trying to generate a self-signed certificate using the instructions that Heroku suggests

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I am trying to generate a self-signed certificate using the instructions that Heroku suggests here: http://www.akadia.com/services/ssh_test_certificate.html

This creates sever.key and server.crt.

I then try to add them to heroku using the following command:

heroku ssl:add server.crt server.key and I get the following error

Domain name not found. Make sure the domain mycorrectdomain.heroku.com is added to your Heroku app / Key doesn’t match the PEM certificate

Here is the contents of the server.crt file:

-----BEGIN CERTIFICATE-----
MIICvTCCAiYCCQDyHGnBdtovbzANBgkqhkiG9w0BAQUFADCBojELMAkGA1UEBhMC
VVMxCzAJBgNVBAgMAkNBMRIwEAYDVQQHDAlQYWxvIEFsdG8xEzARBgNVBAoMClR1
dG9yQ2xvdWQxETAPBgNVBAsMCFNvZnR3YXJlMSMwIQYDVQQDDBp0ZXN0LXR1dG9y
Y2xvdWQuaGVyb2t1LmNvbTElMCMGCSqGSIb3DQEJARYWYmxhaXJAbXl0dXRvcmNs
b3VkLmNvbTAeFw0xMTA4MDMxNzQ4NDdaFw0xMjA4MDIxNzQ4NDdaMIGiMQswCQYD
VQQGEwJVUzELMAkGA1UECAwCQ0ExEjAQBgNVBAcMCVBhbG8gQWx0bzETMBEGA1UE
CgwKVHV0b3JDbG91ZDERMA8GA1UECwwIU29mdHdhcmUxIzAhBgNVBAMMGnRlc3Qt
dHV0b3JjbG91ZC5oZXJva3UuY29tMSUwIwYJKoZIhvcNAQkBFhZibGFpckBteXR1
dG9yY2xvdWQuY29tMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCqWEjXRDo0
CBzoIqnpzPN6Ussf476JDX+9uCkpaSyR6Oxarjpc55lw+Mnb9UNiBWPS6JJ/Hq2c
CgkGD9uu11OXRCRvsZeyJjd2YT1B+XZsXrKZVj2C2dj1r6DXzAV2G5EwWJDklaH3
x1uA+muPt7NZ4Dz2WNv9FMyicTTCdMhWlwIDAQABMA0GCSqGSIb3DQEBBQUAA4GB
AJYAgjiHyUxyeFRR2nJ3CLanjNtkzVz+Dk7pdu/p0P35YpYhE95q76xgcOFasWe2
+pUwxTjtQvhc0BRHjohSjiF8+ZFLRfsPq9kmh55AFzDj7V8dzUek4yVyZRtcIdNQ
Gx8I5g8vJClLnHbYQlaCupVIxVZqnp7SKeeshduCsJ/8
-----END CERTIFICATE-----

Any ideas?

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1 Answer

  1. Editorial Team

    Just in case others are getting this error – I was getting the same error setting up a test hostname SSL certificate for my app.

    The answer was that I had not added the domain name the certificate was for first – it does not explicity say this in the Heroku SSL docs. So before adding the cert do:

    heroku domains:add secure.mydomain.com

    and then you can add the certificate:

    heroku ssl:add ssl.crt ssl.key
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