Certificate Routines X509 Check Private Key

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Certificate installation on Apache webserver at times triggers the error message “Certificate routines:X509_check_private_key:key values mismatch”.
This usually happens during an Apache service restart.
As a part of our Server Management Services, we help our Customers to fix SSL related errors regularly.
Let us today discuss the possible causes and fixes for this error.
As discussed earlier, restart of the Apache service while installing a certificate on the webserver at times yield a key values mismatch error. A typical error message looks like the one below:
[Fri Mar 07 14:59:57 2014] [error] SSL Library Error: 185073780 error:0B080074:x509 certificate routines:X509_check_private_key:key values mismatch
The most common reason for this error include
A major reason for this error is the usage of an incorrect private key along with the certificate received from the Certificate Authority. In reality, it implies that the private key in the VirtualHost section of the .conf file didn’t match the SSL Certificate in the same section.
For the webserver to accept a certificate, we should use the same private key along with the CSR code given for the certificate activation.
We can check whether the certificate matches the private key using the following OpenSSL commands:
openssl x509 -in /path/to/certificate.crt -noout -modulus | openssl sha1
openssl rsa -in /path/to/private.key -noout -modulus | openssl sha1
Replace the file names in the commands with the exact one for the certificate and private key. The first command applies to the certificate file from the Certificate Authority. The second one is for the private key.
If the outputs of the commands differ, this means that the chosen private key does not match the certificate.
Thus we will need to find another private key file on the server. The command below will help us with it:
This command will find all files on the server with .key extensions. Once the keys are found, check their moduli using the OpenSSL rsa command listed above to locate one that matches.
If a private key with a modulus matching the certificate cannot be found, we need to generate a new CSR code and reissue the certificate.
Sometimes, we can fix the issue by creating a new CSR from the existing private key file. The command for this operation is:
openssl req -new -key your_domain_com.key -out your_domain_com.csr
Prior to Apache version 2.4.8, SSLCertificateFile was extended to load intermediate CA certificates from the server certificate file as well. It allowed the certificate file to contain the certificate as well as intermediate certificates.
Thus, it is important to place the end-entity certificate for a domain as the first certificate in this file, while intermediate certificates should be placed lower starting from the one that signs the end-entity certificate. Otherwise,it triggers the key values mismatch error.
This order correct order should be as follows: end-entity certificate (your_domain.crt) -> first intermediate -> second intermediate -> root.
[Need any further assistance in fixing SSL errors? – We’re available 24*7]
In short, “Certificate routines:X509_check_private_key:key values mismatch” triggers during SSL certificate installation. Today, we saw how our Support Engineers fix this error.
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I'm not able to setup SSL. I've Googled and I found a few solutions but none of them worked for me. I need some help please...
Here's the error I get when I attempt to restart nginx:
My certificate is from StartSSL and is valid for 1 year.
I also checked the modulus, and I get a different modulus for both key and certificate.
Galou
Galou 1,269●22 gold badges●1010 silver badges●77 bronze badges
I got a MD5 hash with different results for both key and certificate.
This says it all. You have a mismatch between your key and certificate.
The modulus should match. Make sure you have correct key.
dev0z
dev0z 1,835●1313 silver badges●1616 bronze badges
Unless I'm missing something, you absolutely WANT the public and private keys (the certificate file and the key file) to be different. – Mark Berry Oct 2 '19 at 23:21
The modulus' and the public exponent' portions in the key and the Certificate must match. No doubt the files are different. The key is generated for one particular cert. – dev0z Oct 4 '19 at 0:15
Once you have established that they don't match, you still have a problem -- what to do about it. Often, the certificate may merely be assembled incorrectly. When a CA signs your certificate, they send you a block that looks something like
they'll also send you a bundle (often two certificates) that represent their authority to grant you a certificate. this will look something like
except that unfortunately, they won't be so clearly labeled.
a common practice, then, is to bundle these all up into one file -- your certificate, then the signing certificates. But since they aren't easily distinguished, it sometimes happens that someone accidentally puts them in the other order -- signing certs, then the final cert -- without noticing. In that case, your cert will not match your key.
You can test to see what the cert thinks it represents by running
Near the top, you should see "Subject:" and then stuff that looks like your data. If instead it lookslike your CA, your bundle is probably in the wrong order; you might try making a backup, and then moving the last cert to the beginning, hoping that is the one that is your cert.
If this doesn't work, you might just have to get the cert re-issued. When I make a CSR, I like to clearly label what server it's for (instead of just ssl.key or server.key) and make a copy of it with the date in the name, like mydomain.20150306.key etc. that way they private and public key pairs are unlikely to get mixed up with another set.
Vynce
Vynce 2,371●22 gold badges●1212 silver badges●1212 bronze badges
This fixed it for me on Nginx! – TTT Mar 26 '15 at 16:57
Huge +1 for showing how to see what's in the cert chain. – cbednarski Apr 4 '15 at 0:09
Definitely useful, I spend one hour trying to understand why nginx was refusing the certificate while I could see it contained the data – Jacopofar May 8 '15 at 13:45
Ok, this also worked for me with a Comodo cert and Ngix. Just pushed the last cert block to the top. Thx for the detailed explanation and insight to this issue. – Andy D Feb 7 '17 at 15:59
It helps to me to! Very useful answer! Thank you so much! – Oleg Klimenko Apr 20 '17 at 15:50
Check an MD5 hash of the public key to ensure that it matches with what is in a private key
dev0z
dev0z 1,835●1313 silver badges●1616 bronze badges
muru
4,282●3030 silver badges●6969 bronze badges
Good advice ! Well, still get the same error even if md5 hash are the same for me ^^ – Delphine Mar 4 '16 at 15:02
Thank you for including how to verify the hashes. I found out I had a copy paste error, and was missing a single dash from the beginning of my pem. You just saved me a lot of headaches. Cheers. – Justin Fortier May 25 '16 at 15:41
I had this problem because i was adding bundle and certificate in wrong order so maybe this could help someone else.
And Please don't forget to update the appropriate conf (ssl_certificate must now point to the chained crt) as
If the server certificate and the bundle have been concatenated in the wrong order, nginx will fail to start and will display the error message:
Mandeep Gill
Mandeep Gill 3,527●11 gold badge●2222 silver badges●2929 bronze badges
muru
4,282●3030 silver badges●6969 bronze badges
This is actually a better answer to that question than accepted one. – baldrs Jan 7 '19 at 22:44
Fantastic! This is EXACTLY the problem. – Rafael Pizao Feb 23 at 3:19
exactly what I want! thanks man – Ali May 10 at 9:20
If this happens and you are using Let's Encrypt / certbot, the reason is most likely that you used chain.pem instead of fullchain.pem.
Marian
Marian 4,919●22 gold badges●1616 silver badges●2121 bronze badges
Or the order of the certs in the bundle are wrong: first letsencrypt, then the own cert. – ingopingo Dec 30 '17 at 15:51
I had the same problem and finally resolved it by changing the order of pem blocks in certificate file.
The cert block should be put in the beginning of the file, then intermediate blocks, then root block.
I realized this problem by comparing a problematic certificate file with a working certificate file.
fuweichin
fuweichin 795●77 silver badges●99 bronze badges
I had same problem. After about 1 hour looking after it, I found I pasted the certificate incorrectly.
Nick
Nick 8,561●22 gold badges●3737 silver badges●6464 bronze badges
In my case I've wanted to change the SSL certificate, because I've e changed my server so I had to create a new CSR with this command:
I have sent mysite.csr file to the company SSL provider and after I received the the certificate crt and then I've restarted nginx , and I have got this error
After a lot of investigation, the error was that module from key file was not the same with the one from crt file
So, in order to make it work, I have created a new csr file but I have to change the name of the file with this command
Then I had received a new crt file from the company provider, restart nginx and it worked.
lemon fish
lemon fish 9●11 bronze badge
Muhammad Dyas Yaskur
4,538●88 gold badges●2828 silver badges●5050 bronze badges
I ran into this issue (twice) with nginx and none of the solutions in this post explained the issue. The blog post here by a nice gentleman named Marco nailed it, and I am pasting it here for anyone who also runs into what I was seeing. https://medium.com/@mrkdsgn/steps-to-install-a-go-daddy-ssl-certificate-on-nginx-on-ubuntu-14-04-ff942b9fd7ff
In my case, go-daddy was the CA and this is specific to how they issue the cert and the intermediate cert bundles.
With Nginx, if your CA included an intermediate certificate, you must create a single chained certificate file that contains your certificate and the CA’s intermediate certificates.
You can use this command to create a combined file called example.com.chained.crt:
cat example.com.crt intermediate.crt > example.com.chained.crt
Shyam Habarakada
Shyam Habarakada 13.7k●33 gold badges●3232 silver badges●4646 bronze badges
Im my case the problem was that I cretead sertificates without entering any data in cli interface. When I regenerated cretificates and enetered all fields: City, State, etc all became fine.
Viktor Kruglikov
Viktor Kruglikov 477●66 silver badges●1515 bronze badges
It happened to me when I combined the bundle.crt and main cert. The reason was I copied the main cert below the bundle.crt. It should be the other way around
openssl req -newkey rsa:2048 -nodes -keyout domain.com.key -out domain.com.csr
SSL file domain_com.crt and domain_com.ca-bundle files, then copy new file in paste domain.com.chained.crt.
electrocoder
electrocoder 11●44 bronze badges
kenorb
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SL_CTX_use_PrivateKey("/etc/nginx/ssl/file") failed (SSL: error:0B080074:x509 certificate routines:X509_check_private_key:key values mismatch)
This error can happen, when the certificate private key (ssl_certificate_key, e.g. .key or .pem file) does not match the public certificate file (ssl_certificate) in your Nginx configuration (check nginx.conf or in sites-enabled/). Make sure both files are matching.
Check Nginx error logs for further details (e.g. /var/log/nginx/error.log).
kenorb
kenorb 122k●6666 gold badges●598598 silver badges●634634 bronze badges
In my case I have to concatenate the certs of my domain.
And in the config file /etc/nginx/nginx.conf
mariofertc
mariofertc 355●22 silver badges●77 bronze badges
I had the same issue on Nginx but below is helped me to fix it.
I have removed the bundle and updated it with crt file.
The bundle isn’t 100% necessary, but it improves compatibility.
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