Some of our users have received reports about their AddTrust External CA Root or USERTrust RSA Certification Authority certificate. The problem occurs because the remote server sends a root certificate in the chain that will expire in less than 14 days.

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Citrix receiver ERROR: 'You have not chosen to trust 'USERTrust RSA Certification Authority' on MacBook (version El Capitan) Ask question Announcements.

Here are the steps to verify this and a few tips on how to resolve it.

USERTrust ECC Certification Authority: USERTrust ECC Certification Authority: ECDSA: 384 bits: SHA-384: 5C 8B 99 C5 5A 94 C5 D2 71 56 DE CD 89 80 CC 26: 23:59:59 Jan 18, 2038: 1.3.6.1.4.1.6449.1.2.1.5.1: 4F F4 60 D5 4B 9C 86 DA BF BC FC 57 12 E0 40 0D 2B ED 3F BC 4D 4F BD AA 86 E0 6A DC D2 A9 AD 7A: USERTrust RSA Certification Authority. After a colleague deployed Citrix for a customer the other day, they complained that they had a mac user that was getting certificate errors. They had a publicly signed wildcard certificate, but this user was still having problems. If your using a netscaler you will need to download and install the intermediate CA certificate then link it. If you work with strict clients or systems that only accept full SHA256 (or more) certification chain, you can install the following chain on your server. It has the same name but it signed in SHA284: USERTrust RSA Certification Authority. Then the chain will be shortened and won't include a SHA1-signed certificate.

What are the AddTrust External CA Root expiration notifications? #

Oh Dear checks all the certificates your server sends back to us whenever we connect to it.

/download-mov-to-mp4-converter-mac.html. Sometimes we just get 1 certificate back, sometimes we receive an entire chain of certificates (this is usually the correct thing to do, minus the root certificate).

Sometimes, we receive certificates where - in the middle of the chain - an expired certificate is present. We alert on these, as clients might block connections when one certificate in the chain is expired.

Sometimes, and it's rare, a server sends a root certificate along that is close to expiry, but actually isn't needed.

For some of our users, they've received these reports for the AddTrust External CA Root and USERTrust RSA Certification Authority root certificates.

Verify that the SSL certificates are indeed about to expire #

It's a bit technical, so if this doesn't make a whole lot of sense, we suggest you reach out to your hosting provider or your SSL Certificate provider - they'll be able to help out!

Forward them this post, and they'll be able to fix things for you.

In this example, we'll connect to a random Tumblr blog and request the certificates. Tumblr appears to be one of the larger providers worldwide that's sending a soon-to-expire root certificate along in their chain.

Update: they since removed the old expiring root from their chain.

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That's a lot of text right there!

The very last certificate is the AddTrust External CA Root certificate. This is the one that's causing a bit of problems at the moment. If we decode that blob of text, we can see why.

To decode a certificate, copy/paste the certificate between the -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- (including those lines) and save it to a text file. It should look a little something like this:

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We named our text file certificate.crt.

That particular certificate expires on May 30 10:48:38 2020 GMT. In other words, in just about 14 days.

Validating the SSL Certificate Path #

There are several paths possible to validate the certificate of .tumblr.com. One of them doesn't even require the AddTrust External CA Root certificate:

Since that soon-to-expire root certificate that is being sent along isn't actually needed, it should be safe to remove it from your intermediate certificate list.

Or, perhaps even better, replace it with an up-to-date one that is valid for your certificate chain.

Replace or remove the old root-certificate in your chain #

It's best to doublecheck this with your SSL Provider, to verify the best course of action here.

If you are in control of your own webserver/proxy/SSL setups, you should be able to find the following certificate somewhere in your intermediate certificate list, and remove it.

This file is usually referenced in your webserver configs, it might look like this:

In Nginx:

In Apache:

Open that file, take a back-up, and remove the certificate referenced above here.

Restart your webserver to load the new certificate configurations, and doublecheck if everything still works properly.

Why does Oh Dear report on these certificates? #

We verify every certificate that gets sent by the server. In this case, the final root certificate that was being sent isn't technically needed to validate the certificate chain, as there's a local root certificate present (on your own device) that perfectly does that already.

It's unclear how every device in the wild would react if a server sends along an expired, but ultimately unneeded, root certificate.

How would an old Android phone react? Or an embedded device, running old firmware? We can't know, so we prefer to err on the side of caution and alert you that the server is sending along expiring certificates.

Hopefully this post can help you identify the problem and roll out a solution!

Update: we will modify our alerting settings #

After internal debates, we've decided to make the behaviour of these alerts configurable.

To be clear: the server should not send an expired root certificate back to the client. It's impossible to predict how old devices might respond, and it'll surely break some embedded devices or devices with older SSL validation logic.

However, modern browsers treat this as a non-issue, since they can find a different path to validate the certificate and tie it to a valid root certificate.

In one of our next releases, you will be able to select if we should validate all certificates a server sends, or just the domain certificate. The default will be to validate all certificates, as we've always done.

In some scenario's, it's difficult or near impossible to change the certificate chain (ie: shared hosting setups that offer little to no control of the certificates). For those scenario's, you might want to disable the validation of all certificates (even though it might cause issues for some clients).

Expand section Frequently Asked Questions

Yes. If you have a certificate valid into June 2020 and beyond, you can set the clock on your system forward to June 1st 2020, and test the site.
Modern browsers will display no errors, and you can see that the certificate chains back to the COMODO or USERTrust root. (Note: some browsers such as Google Chrome, will detect that your clock is “wrong” and show a warning unrelated to the certificates as a result.)
Here is a test site you can use to evaluate your environment here

• These links provide a valid certificate issued from specific chains.
• They can be used to test what clients support which roots.
• You can also adjust your system clock into June 2020 to see how clients function after the expiry of the AddTrust root and cross-certificates.

The modern roots: COMODO RSA/ECC Certification Authority and USERTrust RSA/ECC Certification Authority:

• USERTrust RSA Certification Authority - https://crt.sh/?id=1199354USERTrust ECC Certification Authority - https://crt.sh/?id=2841410
• COMODO RSA Certification Authority - https://crt.sh/?id=1720081COMODO ECC Certification Authority - https://crt.sh/?id=2835394

*clicking the 'certificates' label on crt.sh links provides a download to the certificate file itself*
These roots were added to the following platforms since:
Apple:

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• macOS Sierra 10.12.1 Public Beta 2
• iOS 10

Microsoft:

• Windows XP (via Automatic Root Update; note that ECC wasn't supported by Windows until Vista)
• Windows Phone 7

Mozilla:

• Firefox 3.0.4 (COMODO ECC Certification Authority)
• Firefox 36 (the other 3 roots)

Google:

• Android 2.3 (COMODO ECC Certification Authority)
• Android 5.1 (the other 3 roots)

Oracle:

• Java JRE 8u51

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Opera:

• [Browser release on December 2012]

360 Browser:

• SE 10.1.1550.0 and Extreme browser 11.0.2031.0

The cross-certificates with AAA Certificate Services provide compatibility to older versions:

• Apple iOS 3.
• Apple macOS 10.4.
• Google Android 2.3.
• Mozilla Firefox 1.
• Oracle Java JRE 1.5.0_08.

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AAA Certificate Services self-signed root [expiring 2028] - https://crt.sh/?id=331986
AAA Certificate Services - cross-certificates:
AAA Certificate Services - USERTrust RSA Certification Authority - https://crt.sh/?id=1282303295 AAA Certificate Services - USERTrust ECC Certification Authority - https://crt.sh/?id=1282303296
AAA Certificate Services - Comodo RSA Certification Authority - https://crt.sh/?id=2545965608 AAA Certificate Services - Comodo ECC Certification Authority - https://crt.sh/?id=2545966120

What if I have infrastructure or an application that only trusts AddTrust?
If a system or application only trusts the AddTrust External CA

root and not the more modern Comodo or USERTrust roots – errors will occur after May 30th, 2020.

Precautionary measures and notes for legacy environments/devices:

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• You may need to update any such systems to include more modern roots if it’s possible to do so. If the platform doesn’t support modern algorithms (SHA-2, for example) then you will need to speak to that system vendor about updates.
• Customers who have embedded AddTrust External CA Root into their applications or custom legacy devices may need to embed the new USERTrust RSA CA Root replacement before the May 2020 expiry date.
• Sectigo has other, older, legacy roots apart from the AddTrust root, and we have generated cross-certificates from one in order to extend backward compatibility. The cross certificate is signed by the root called “AAA Certificate Services.” Please contact Support or your Account Manager for details.