5 WordPress Migration Mistakes That Can Cause Website Downtime

Afifa Sulehri — Thu, 15 Oct 2026 23:21:19 +0000

Your new hosting environment is ready. The WordPress files have been transferred. The homepage loads perfectly.

Then someone tries to place an order, and the checkout stops working.

Website migrations often appear successful long before they're actually complete.

Moving a WordPress website isn't just about transferring files between servers. A successful migration needs to preserve the database, functionality, email configuration, security settings and the experience of the people using the website.

Here are five common mistakes that can cause unnecessary downtime—and how to avoid them.

1. Migrating Without a Tested Backup

Creating a backup is usually the first item on a migration checklist. But having a backup file doesn't guarantee that you can restore your website successfully.

A complete WordPress migration may involve several components:

WordPress application files and themes
Installed plugins and uploaded media
The WordPress database
Important configuration files
Server-specific settings

Before starting, confirm that you have a recent backup and know how to restore it.

For a busy WooCommerce store or membership website, consider how new orders, accounts and other database changes will be handled during the migration window.

Practical advice: Test the restoration process in a separate environment before depending on that backup.

2. Changing DNS Before Testing the New Website

This is one of the easiest ways to create a stressful migration.

The new hosting account is configured, so someone updates the DNS records immediately.

But what if the new server has an incompatible PHP version? What if the SSL certificate isn't ready? What if the contact form depends on a missing server extension?

Now visitors may be reaching a website that hasn't been properly tested.

A safer approach:

Prepare the new environment first.

Use a staging URL or an appropriate local hosts-file override to test the destination server before changing public DNS.

Check the homepage, internal pages, WordPress administration, forms and any important customer journeys.

Where appropriate, reduce DNS TTL ahead of the planned migration window. Remember that DNS caching behaviour varies, and a lower TTL does not guarantee an instant switch.

Practical advice: Treat DNS cutover as one of the final steps—not the first.

3. Overlooking PHP, Plugins and Server Compatibility

A website can function perfectly on one server and behave differently on another.

WordPress depends on more than its application files.

PHP versions, database versions, server extensions, caching, rewrite rules and plugin requirements can all affect the result.

For example, a WordPress website might rely on:

A PHP extension available only on the original server
A caching plugin configured for the previous hosting environment
Custom redirects or web-server rules
Scheduled background tasks
Third-party API connections

Before migration, document the current environment and compare it with the destination.

Check plugin compatibility, review server logs and test any critical features.

Avoid combining a hosting migration with several major plugin and theme upgrades unless those changes have been tested together.

Practical advice: Reduce the number of things changing at the same time.

4. Forgetting About Email and Dynamic Website Data

It's possible to move a WordPress website successfully and still disrupt the business using it.

Email is a common example.

A domain's DNS zone may contain MX, SPF, DKIM and DMARC records that support email delivery and authentication.

If those records are accidentally omitted or replaced during a DNS migration, email service can be affected even while the website appears normal.

Dynamic data needs similar attention.

An online store may receive new orders while files and databases are being transferred.

A booking website may receive appointments during the cutover.

If the final database copy does not include those changes, valuable information can be lost.

Practical advice: Plan how email DNS records and live database writes will be preserved. For transactional websites, coordinate a controlled final synchronisation or maintenance window when necessary.

5. Finishing the Migration Without Proper Verification

The DNS change is complete. The website loads. Everyone assumes the job is finished.

But the homepage is only one part of the website.

After the migration, verify the functionality that matters to your users.

A useful post-migration checklist includes:

Homepage and important internal pages load correctly
HTTPS and SSL certificates work as expected
Contact forms and transactional emails work
WordPress administration is accessible
Images, stylesheets and scripts load properly
Login, checkout or booking workflows function
Redirects and important URLs remain correct
Backups, scheduled tasks and caching behave as intended

Keep the previous environment available for an agreed rollback period wherever technically and contractually possible.

Monitor server logs and application errors after cutover.

Practical advice: A migration is complete when the business-critical workflows have been verified—not simply when the homepage opens.

A Better WordPress Migration Checklist

Before moving your next WordPress website, make sure you can answer five questions:

Do we have a backup that we know how to restore?
Have we tested the destination environment?
Are the PHP, database and plugin requirements compatible?
Have we accounted for email and changing customer data?
Do we have post-migration checks and a rollback plan?

A well-planned migration may involve more preparation, but it reduces the chances of discovering critical problems after visitors arrive.

And that preparation matters whether you're moving a small business website, an agency client's WordPress installation or a busy online store.

Final Thoughts

Most WordPress migration problems are not caused by the act of transferring files. They happen because an important dependency was missed or the cutover was rushed.

A good migration plan focuses on preserving the experience of the people using the website.

The objective isn't simply to move a website. It's to keep the business working while the website moves.

At Webiost, we focus on practical hosting infrastructure and WordPress operations for businesses that need a reliable online presence.

If you're planning a hosting move, explore our Website Hosting Migration Guide for additional migration planning information.

Published by Webiost | Web Hosting, WordPress & Digital Infrastructure

DEV Community: Afifa Sulehri