How to Fix Outlook Connection Errors

Outlook connection errors can be frustrating, but they're usually caused by incorrect server settings or authentication issues. Here's how to troubleshoot the most common problems.

Common Error Messages

• Cannot connect to the server
• The server you are connected to is using a security certificate that cannot be verified
• Authentication failed
• Outlook keeps asking for your password

Step-by-Step Fixes

1. Verify Your Account Settings

Go to File > Account Settings > Account Settings in Outlook, select your account, and click Change. Confirm:

• Incoming (IMAP): mail.yourdomain.com, Port 993, SSL
• Outgoing (SMTP): mail.yourdomain.com, Port 465 or 587
• Username: your full email address

2. Re-enter Your Password

Click More Settings > Outgoing Server and confirm My outgoing server requires authentication is checked. Re-enter your password on both tabs.

3. Check for SSL Certificate Errors

If you see a certificate warning, make sure your server hostname is mail.yourdomain.com - using a server IP or an alternate hostname can trigger certificate mismatches.

4. Remove and Re-add the Account

If all else fails, remove the account from Outlook and add it again from scratch using the correct settings.

If Outlook continues to show errors, contact our support team - we can review server logs to identify the cause.