When you apply for an SSL certificate, domain validation (DV) is the first step to proving you control the domain name. While the process is usually quick, certain missteps can cause validation to fail, delaying the issuance of your certificate.
At NicSRS, we’ve helped thousands of customers navigate DV verification successfully. Here are the most common reasons why domain validation fails — and what you can do to fix them.

1. Incorrect DNS Settings
One of the most frequent causes of failure is missing or incorrect DNS records.
For DNS-based validation, the Certificate Authority (CA) will look for a specific TXT record. If the record is missing, misspelled, or published on the wrong DNS host, validation will fail.
Tip: Double-check the exact hostname and value provided by your CA before publishing the record.

2. File Upload Errors
When choosing file-based validation, the CA will ask you to upload a file to a specific directory on your website.
Common mistakes include:
· Placing the file in the wrong folder
· Renaming it
· Using an HTTPS redirect that prevents the CA from accessing it
Tip: Use the exact file name and path provided. Test the file’s accessibility via a browser before re-submitting for validation.

3. Email Verification Issues
Email-based validation can fail if the approval email isn’t received or responded to. This may happen because:
· The selected email address (e.g., [email protected]) does not exist
· Spam filters block the message
· The wrong validation address is chosen
Tip: Ensure the selected email address exists and is monitored, and whitelist your CA’s sending domain.

4. Wildcard Domain Format Errors
When applying for a wildcard certificate, the domain name must begin with an asterisk (*.), such as *.example.com.
Mistakes like *example.com (missing the dot) or using a wildcard for sub-subdomains (e.g., *.sub.example.com) may cause immediate rejection.
Tip: Confirm the correct format before submitting your CSR.

5. Choosing File Validation for Wildcard Certificates
Most CAs require DNS validation for wildcard SSL certificates. If you select file-based validation for a wildcard, the request will fail.
Tip: Always use DNS validation for wildcard certificates.

6. CAA Record Restrictions
If your domain has a CAA record that doesn’t authorize your chosen CA, validation will fail.
Tip: Check for CAA records using a DNS lookup tool and update them to allow the CA before ordering.

7. Mismatched Validation Between Main and “www” Domains
If you validate www.example.com using file validation, you must also validate the root domain (example.com) — unless you specifically request the CA to remove it. The reverse is also true.
Tip: If you don’t have control over both domains, contact your reseller or CA to adjust the order.

8. Product-Specific Limitations
Some SSL products have special validation rules:
· GlobalSign DV: The validation method cannot be changed after the order is placed; you must cancel and reorder to switch methods.
· sslTrus BasicSSL: Email validation via the domain administrator’s email address is not supported.
Tip: Review product details before purchase to avoid delays.

Final Thoughts
Most domain validation issues are avoidable with a quick check of DNS settings, file paths, and CA requirements. At NicSRS, we guide our customers through each step and help resolve validation problems quickly — ensuring your SSL certificate is issued without unnecessary delays.
Pro tip: If you encounter difficulties at any stage, contact our validation team — we’re always ready to help you choose the fastest and most reliable validation method for your needs.