Error 534: What Is It & How To Fix It

Amongst the many common email errors you might cross as a salesperson or marketing specialist, is Error 534. Learn what exactly this means and how to fix it in this blog.
Are you frustrated by the “Error 534” message when accessing your email?

Don’t worry, you’re not alone!

This error can be confusing and overwhelming, but with the right information and a bit of problem-solving, you can fix it in no time.

This blog will discuss what Error 534 is, what causes it, and how to fix it.

So, let’s get started and put an end to this frustrating error once and for all!

What Does Error 534 Mean?

An error 534 is a type of authentication error that occurs when a user tries to send an email using an email server.

Still, the server is unable to authenticate the user's login credentials.

The error code usually accompanies a message informing the user that authentication failed and that they need to authenticate first.

When attempting to connect to a web server that requires a secure connection, a 534 error may occur if the client (such as an FTP client) does not have SSL/ TLS enabled. The server will not accept unsecured communication, and the client must use a secure channel to access the server.

When users attempt to establish a connection without Secure Socket Layer (SSL) encryption, they may experience an error that terminates their connection abruptly and without any indication of how the issue can be corrected.

This error can be unexpected and frustrating, as it does not allow users to try other means of connecting.

SSL (Secure Sockets Layer) is a security protocol designed to ensure that all data passing between a web server and its users is encrypted and that only authorized users can access the server.

Suppose a user attempts to connect to an SSL-protected server without using an SSL-encrypted connection. In that case, they will likely receive a 534 error until they establish an SSL connection through their FTP client.

It is always necessary to use an SSL-encrypted connection when accessing a web server, as it provides an added layer of security.

What Causes Error 534?

Error 534 is typically caused by an authentication failure when trying to send an email using an email server.

Here are some common reasons why this error may occur:

Incorrect Login Credentials

The most common reason for an authentication failure is that the login credentials entered by the user are incorrect.

This could be due to a typo in your username or password or if you've forgotten your password and are mistakenly entering the wrong one. To resolve this issue, double-check your login details and try again.

And if you happen to forget your password, don't worry – your email provider should offer a password recovery feature to help you get back in.

Expired or Revoked Security Certificate

Your email server uses a security certificate to establish a secure connection between your email client and the server, and to verify its identity. When this certificate expires, your email server may fail to authenticate your connection, and if revoked due to a security issue, it may reject your login attempt altogether.

But don't let this prevent you from accessing your email. You can contact your email service provider and ask them to renew or replace your security certificate.

Email Client Configuration Issues

Managing your email account should be easy, but sometimes getting your email client to work properly can be challenging. If you're having trouble connecting to the email server, you may need to tweak your settings.

A common issue is entering the wrong SMTP server settings, which can cause login attempts to be rejected.

To avoid this, you'll want to check your email client settings to ensure they match those provided by your email service provider.
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IP Address Issues

Your email server may be rejecting your login attempt due to an unfamiliar or suspicious IP address. This is a security measure to prevent unauthorized access to your account.

To resolve the issue, you can contact your email service provider and request to whitelist your IP address. Alternatively, you can use a VPN service to change your IP address to a trusted one.

Email Service Provider Issues

When using an email service provider, you may encounter technical issues with their servers or authentication systems. This can lead to authentication failures and make it difficult for you to access your account.

If this happens, don't panic – simply reach out to your email service provider and ask them to investigate the issue.

They will work to provide a solution so you can get back to using your account as usual.

How to Fix Error 534?

Ensuring a successful FTP connection to a remote web server or successful file transfer can be easily achieved by enabling SSL on your FTP client.

If you use commands or have an automated FTP connection in your code, enable the necessary SFTP flags before executing the commands and provide the appropriate username and password.

FileZilla is the most popular FTP client when troubleshooting the 534 SSL error in an FTP connection, and the fix detailed here may be of assistance.

However, it should be noted that this same fix may require slight modification depending on the configuration interface of other FTP clients.
1- Check the error code to determine the exact cause of the error. Error 534 is usually related to an incorrect username or password.

2- Confirm the username and password are correct. Double-check any capitalization if you are using a case-sensitive username. Try entering the username and password manually instead of copying and pasting.

3- Contact your email server administrator or hosting provider for assistance. They can help you troubleshoot the issue and confirm that your account settings are correct.

4- Check your email client settings. You may need to change the authentication settings depending on which email client you are using.

5- Change your password. You may need to reset your password if you cannot log into your email account. Once you have changed your password, update the settings in your email client.

6- Clear your browser cache and cookies. This can help resolve common authentication issues.

7- Try using a different browser or device.

8- Disable any firewalls or antivirus software. This can also help narrow down any compatibility issues.

9- If all else fails, contact your internet service provider.


Error 534 is a common issue that can occur due to a variety of causes. Fortunately, there are a few easy steps you can take to try and resolve the issue.

First, make sure you are using the correct login credentials and that your firewall is not blocking the connection. Additionally, try clearing your browser's cache and cookies.

If these solutions do not work, you may need to check your email server settings or contact your internet service provider.

With a few simple steps, you can get your email running again and keep sending cold emails.

This is a sign to warm up your email before sending cold emails with Unfiltered!
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