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"Cannot Verify Server Identity" is a common error in iPhone and other iOS devices.

It means that device considers the mail server'south certificate is fake.

Here at Bobcares.com nosotros see this error most every 24-hour interval as part of our Outsourced Tech Support services, where we manage the tech support operations of web hosts, digital marketers, and more than.

A typical fault message looks similar this:

cannot_verify_server_identity

What is the error Cannot Verify Server Identity?

When an iPhone tries to connect to a mail server securely, it'll fetch the server'due south "SSL certificate" and check if it is reliable.

If it finds the document expired, or not matching the domain name, or non signed past a well-known company, information technology'll mark the cert as unreliable.

At that betoken, the secure connexion fails, and iPhone or the device volition bear witness the fault "Cannot Verify Server Identity".

Nosotros see this mistake usually when:

The mail server's certificate is inverse (eg. new issuer), or
A new business relationship is existence setup in iPhone, or
Afterwards an business relationship migration

Unfortunately, the fault can announced when using any mail servers. It even pops up with popular postal service servers like eas.outlook.com, imap.gmail.com, etc. too.

What are the causes of Cannot Verify Server Identity error?

Of form, at that place are cases where this error is shown when the certificate is indeed bad (expired, wrong domain, etc.).

But nosotros often see cases where valid certificates are also misclassified as imitation by iPhone. The two major reasons nosotros've seen are:

ane. A mismatch between Domain proper noun and Server proper name

Many hosting companies provide the mail server name as "post.website-name.com".

Whereas, the certificate of the mail server will be in the format "mail.server-name.com".

When configuring iPhone users put in their post server every bit "mail.website-name.com", but when iPhone fetches the certificate, it sees the name "mail.server-proper noun.com" printed in it.

iPhone plays safety and marks the certificate as unreliable.

How we fix it

We set it in 3 ways:

Change postal service server name – In cases where the hosting customer has a VPS account, nosotros change the post server name to match the certificate proper noun.
Fix postal service configuration – If the hosting user is a Shared Hosting customer, we help them change iPhone'south mail server settings to utilize "mail service.server-name.com" instead of "mail.website-name.com".
Setup a costless dedicated document – For VPS users who didn't employ a valid certificate (eg. cocky-signed certs are untrusted), we setup certificates from Permit's Encrypt, which is a valid CA that provides free SSLs.

two. "Issues" in iPhone & iOS

Apple uses pretty potent checks to ensure document security.

So, if there is no style to change the server's certificate name or the mail user's MX name, the error will remain no affair what.

In the cases where this error comes upwardly subsequently a server document alter, we aid mail users to explicitly add the server's SSL certificate to the "Trusted" listing.

To do that,

Tap on the "Details" button shown in the error bulletin.
And in the next screen, tap on the "Trust" link.

Cannot Verify Server Identity - iPhone - Trust certificate

How to fix information technology in iOS 10.x+

In the after versions of iPhone and iOS x.ten+, this option to add certificates to "Trusted" listing is no longer available.

And then, for such devices, we've institute these steps to work:

Delete all mail accounts related to your domain.
- Become to Settings –> Accounts & Password –> [Account Name] –> Delete Account.
So delete all approachable postal service servers in settings.
Re-add together the postal service account(s).

This volition provide the option to "Trust" the certificates again as described above.

Bonus: Changing SSL settings

We are adding this tip from various feedbacks, and from our ain experience in the past 2 years.

In many cases disable SSL can also fix the error.

The exact steps involve:
– Open up the Settings app and browse for Passwords & Accounts.
– Tap the mail app that is causing problems.
– Next, Select the registered Account.
– Navigate to Avant-garde settings and disable the Use SSL characteristic.

However, sending emails over non-secure methods can gamble your data.

Reinstall Outlook/Gmail mail service server certificates

Recently, when a client reported the cannot verify server identity mistake in Outlook, our Dedicated Engineers fixed information technology by reinstalling the document.

i. Users will receive Internet security warning with 3 options, Yes, No, View Certificate. Hither, we click the View Document button.
2. And then Click on Install Certificate.
3. Adjacent, we will see the import wizard. Go out Current user selected and click next.
iv. Choose "Automatically select the certificate store based on the type of certificate".
v. Click Stop.

Conclusion

"Cannot Verify Server Identity" error is acquired by iPhone's and iOS's strict verification of mail server certificates. Today we've covered the top two causes for this error, and how our Support Engineers ready this fault.

Originally published on 15th Sep 2018. Updated on 31st Jan 2020

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