The Most Common Problems During Website Migration

Website migration is rarely difficult because of a single issue. In most cases, problems appear when DNS, files, databases, email, or application settings are not moved in the right order. A successful migration depends on planning, testing, and verifying every component before you switch traffic to the new hosting environment. This is especially important when moving sites between hosting providers, upgrading to managed hosting, or transferring a website through a control panel such as Plesk.

Most migration problems are preventable. The common failures usually involve broken links, missing media, database connection errors, SSL certificate issues, email delivery interruptions, and unexpected downtime caused by DNS propagation. If you understand where migrations typically fail, you can reduce risk and complete the move with minimal disruption.

What usually goes wrong during a website migration

Website migration is more than copying files from one server to another. A modern website often includes a web application, a database, DNS records, cron jobs, email accounts, SSL certificates, subdomains, redirects, and cache layers. If even one of these parts is missed, the site may not behave correctly after the move.

The most common problems during website migration include:

Incomplete file transfers
Database import errors or mismatched credentials
Incorrect DNS updates or slow propagation
SSL certificate problems
Broken links, missing images, or changed URLs
Email interruption or lost mailbox data
PHP version, extension, or permission mismatches
Unexpected downtime during the cutover
Application-specific issues in WordPress, Magento, Joomla, or custom sites

In a hosting platform or Plesk environment, many of these issues can be checked in advance. A structured migration plan helps you identify dependencies before traffic is moved to the new server.

Incomplete website files

One of the most frequent migration issues is missing files. This happens when the document root is copied but hidden files, media directories, configuration files, or application-specific folders are overlooked. On Linux-based hosting environments, hidden files such as .htaccess may be essential for rewrites, redirects, or security rules.

Common symptoms

Images or downloads do not appear
Stylesheets or JavaScript files fail to load
Some pages return 403 or 404 errors
Redirects or security rules stop working

How to avoid it

Confirm the full site structure before transfer
Include hidden and system files in the migration
Verify media directories such as uploads, images, or assets
Check file ownership and permissions after upload

If you are using Plesk, compare the source and destination subscription structure to ensure the website files are placed in the correct document root.

Database connection issues

Many websites depend on a database to store content, settings, and user data. During migration, the website files may be copied correctly, but the application can still fail if the database is not imported or if the connection details are outdated.

Common symptoms

“Error establishing a database connection” in WordPress
Blank pages or application errors
Login problems in the admin panel
Missing content, products, or posts

Typical causes

The database export was incomplete
The import was interrupted by size limits or timeout limits
Database credentials were not updated in the configuration file
The database user does not have the required privileges

How to avoid it

Export the database using a reliable tool, such as phpMyAdmin, CLI, or a hosting panel backup feature
Import the database fully before changing DNS
Update connection settings in wp-config.php or the relevant app config file
Check database name, username, password, and host value

For managed hosting environments, it is useful to confirm whether the database host is local, remote, or container-based, especially if the application was moved between different server architectures.

DNS changes and propagation delays

DNS is one of the biggest sources of confusion during a website migration. Even when the website is perfectly prepared on the new server, visitors may continue seeing the old version until DNS changes propagate across the internet.

Why DNS causes migration problems

When you update an A record, AAAA record, CNAME, or nameserver, not every resolver refreshes immediately. Some users may be routed to the old server while others reach the new one. If the old environment is removed too early, part of your audience may see downtime or mixed results.

Common symptoms

Some visitors see the new site, others see the old site
Email works on one device but not another
The domain resolves inconsistently
Browser cache appears to show the wrong version

How to avoid it

Lower DNS TTL values before migration when possible
Keep both old and new environments active during propagation
Use hosts file testing to confirm the new server before switching DNS
Check all relevant records, not only the website A record

In a hosting control panel like Plesk, DNS records are often managed separately from website files and mail settings. Make sure you verify all records, including subdomains, mail exchangers, and verification records used by third-party services.

SSL certificate and HTTPS problems

After migration, websites sometimes fail to load securely because the SSL certificate was not moved, reissued, or installed correctly. This can break trust signals, cause browser warnings, and interfere with login or checkout pages.

Common symptoms

Browser security warnings
Redirect loops between HTTP and HTTPS
Mixed content errors
Site loads unsecured even though SSL is enabled

How to avoid it

Install or reissue the SSL certificate on the new server
Verify the certificate matches the domain and subdomains
Update forced HTTPS rules after migration
Scan for mixed content from old URLs or hardcoded resources

If you use Let’s Encrypt in Plesk, confirm that the certificate is issued for the correct domain set, including www and any required aliases. For WordPress sites, also make sure the site URL and home URL settings use the correct HTTPS address.

Broken links, missing images, and outdated URLs

Another common problem appears after the site is live on the new host. The content loads, but some internal links, image paths, or embedded resources still point to the old domain or old server path. This often happens when URLs are hardcoded in the database or theme files.

Common symptoms

Images display from the old domain
Internal links redirect incorrectly
Menus or buttons go to dead pages
Embedded media or scripts fail to load

How to avoid it

Use a search-and-replace tool to update old domain references
Check content, page builders, and widgets for hardcoded URLs
Review theme files and custom code
Test pages across desktop and mobile views

For WordPress migration, a safe database search and replace is often necessary because absolute URLs may be stored in posts, options, page builder data, or serialized content. Always use a migration-aware tool to avoid corruption.

Email migration interruptions

Email is frequently forgotten during website migration, even though it is often the most sensitive part of the move. If mailboxes, aliases, forwarders, or DNS mail records are not handled carefully, users may lose access to messages or experience delivery failures.

Common symptoms

Emails stop arriving
Outgoing messages are rejected
Mailbox folders appear empty after migration
Outlook or mobile clients stop syncing

How to avoid it

Migrate mailboxes separately if email is hosted on the same platform
Verify MX, SPF, DKIM, and DMARC records
Keep the old mail service active during transition
Reconfigure email clients after the move if server names changed

In a managed hosting setup, it is important to distinguish between website hosting and email hosting. If both services are on the same account, migration must include mail data, mail routing, and DNS updates together.

PHP version and extension mismatches

Many migration issues happen because the destination server runs a different PHP version or has a different extension set than the source. Even small changes can affect compatibility, especially for CMS platforms and custom applications.

Common symptoms

500 Internal Server Error
Deprecated function warnings
Plugin or theme failures
Unexpected slowdowns or blank pages

How to avoid it

Compare the source and target PHP versions
Check required extensions such as cURL, mbstring, gd, intl, and mysqli
Review application compatibility before migration
Test the site in staging before changing DNS

Plesk and many hosting platforms let you select PHP versions per domain. This is useful when migrating older websites that cannot immediately run on the newest release. However, if possible, plan a compatibility upgrade as part of the migration project.

Permission and ownership issues

Website files can be copied successfully and still fail if file permissions or ownership are incorrect. This is common when moving between servers, changing users, or restoring a backup into a new hosting account.

Common symptoms

403 Forbidden errors
Upload failures in the CMS
Cache or backup plugins cannot write files
Images or temporary files cannot be created

How to avoid it

Check ownership after transfer
Set sensible permissions for directories and files
Confirm the web server user can write where needed
Review special folders such as cache, logs, and uploads

Incorrect permissions are especially common in manual migrations via FTP or SSH. If your hosting environment uses a panel-based user structure, make sure the website belongs to the correct subscription or account context.

Application-specific migration problems

Some migration problems are tied to the platform itself. WordPress, Magento, Joomla, Drupal, and custom PHP applications each have their own migration dependencies. What works for one site may not work for another.

WordPress

Site URL and home URL remain pointed to the old domain
Serialized data breaks after an improper search and replace
Plugins cache old paths or old CDN references
Permalinks need to be refreshed after the move

Magento or other eCommerce platforms

Base URLs are not updated correctly
Cache and index data need to be rebuilt
Payment or shipping modules point to old endpoints
Performance depends on correct PHP and database tuning

Custom applications

Environment variables are missing
API keys or secrets were not transferred securely
Absolute paths in code no longer match the new server
Background jobs or cron tasks are not recreated

Before migration, document all app-level settings, scheduled jobs, third-party integrations, and cache layers. This reduces the chance of hidden dependencies breaking after launch.

Downtime caused by poor migration timing

Even a technically correct migration can fail from a business perspective if it is timed poorly. Switching DNS before the new site is fully tested, or decommissioning the old host too early, can result in avoidable downtime.

How to reduce downtime

Prepare the destination server in advance
Clone the site to a staging or temporary URL
Test functionality before the final cutover
Schedule the switch during lower-traffic hours
Keep the source environment online until DNS propagation finishes

For business-critical sites, the safest approach is to freeze content changes shortly before migration, perform a final sync, then switch DNS only after validation. This helps avoid data loss in forms, orders, or new user registrations.

Step-by-step approach to avoid the most common migration problems

A structured process is the best way to prevent issues. The following checklist is suitable for most hosting migrations, including website transfers between providers or servers.

Before migration

Audit the website files, database, email, and DNS records
Identify the CMS, PHP version, and required extensions
Lower DNS TTL values if possible
Create a full backup of files and database
Document all custom settings, cron jobs, and integrations

During migration

Copy all website files, including hidden files
Export and import the database completely
Update configuration files with new credentials
Install or reissue SSL certificates on the new server
Test the site using a temporary URL or hosts file override

After migration

Check the homepage, inner pages, and forms
Verify login, checkout, and admin functions
Confirm images, CSS, JavaScript, and redirects work correctly
Review email sending and receiving
Monitor error logs and performance metrics

If you are using Plesk, also review the domain settings, web hosting configuration, DNS zone, mail settings, and PHP handler for each migrated site.

How to test a migration before going live

Testing is one of the most effective ways to catch problems early. A site may look fine at first glance but still contain hidden issues that only show up under real usage.

Recommended tests

Open the site on desktop and mobile
Submit contact forms and check delivery
Log in to the admin area
Test search, filters, and navigation menus
Load pages that contain videos, galleries, or downloads
Review the browser console for mixed content or script errors

For eCommerce websites, also test carts, checkout steps, tax calculation, and payment gateways. A migration is not complete until the business-critical actions are confirmed.

When to use a staging environment

A staging environment is extremely useful for reducing migration risk. It lets you verify the site on the new hosting environment before public DNS is changed.

Staging is especially helpful when:

The website is large or complex
The site has custom code or third-party integrations
The migration involves a PHP version upgrade
You need to compare performance before and after the move
The website cannot afford prolonged downtime

Many hosting platforms and control panels support staging domains or temporary previews. If staging is available, use it to validate database connectivity, SSL, and application behavior before the final cutover.

FAQ

Why does my website work on the new server but not on the live domain?

This usually means DNS has not fully propagated, or the live domain still points to the old server. Check DNS records, TTL values, and whether the correct IP address is published everywhere.

Why are images missing after migration?

Images are often missing because media files were not copied, the path changed, or the database still references the old URL. Verify the upload directories and update stored URLs if needed.

Do I need to migrate email when moving a website?

Only if your email is hosted with the same provider or server. If email is separate, you may still need to update MX and authentication records so mail delivery continues to work correctly.

What causes a 500 error after migration?

Common causes include wrong PHP version, missing extensions, bad file permissions, invalid .htaccess rules, or broken application configuration. Check the server error log first.

How can I reduce downtime during migration?

Prepare the destination in advance, test using a temporary URL, lower DNS TTL before the move, and keep the old server active until propagation is complete.

Is Plesk useful for website migration?

Yes. Plesk can simplify file, domain, SSL, DNS, and mail management in one place. It is particularly helpful when moving websites between subscriptions or servers with similar hosting structures.

Conclusion

The most common problems during website migration are usually caused by missed dependencies, incorrect DNS handling, or incomplete testing. Files may transfer correctly while the database, email, SSL, or configuration still needs attention. By following a structured checklist and validating the site before and after cutover, you can avoid most migration-related issues.

For hosting providers, managed hosting environments, and control panel-based setups such as Plesk, the key is to treat migration as a coordinated process rather than a simple copy operation. When every component is reviewed in the correct order, website migration becomes predictable, safer, and far less disruptive.

The Most Common Problems During Website Migration