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Outlook Error 0x80042108: Cannot Connect to Server
Quick fix: Check server settings — Outlook > File > Account Settings > double-click your email > Verify incoming/outgoing server addresses, ports, and encryption. Full step-by-step below.
What Causes Outlook Error 0x80042108?
Outlook error 0x80042108 (Cannot Connect to Server) can be triggered by several issues:
- Internet connection problems
- Incorrect email server settings
- Antivirus blocking Outlook
- Outlook profile corrupted
- Email server is down
| Cause | Best fix |
|---|---|
| Internet connection problems | Check server settings |
| Incorrect email server settings | Test internet connectivity |
| Antivirus blocking Outlook | Disable antivirus email scanning |
| Outlook profile corrupted | Create a new Outlook profile |
| Email server is down | Repair Outlook data file |
How to Fix Outlook Error 0x80042108 — Step by Step
Check server settings
Outlook > File > Account Settings > double-click your email > Verify incoming/outgoing server addresses, ports, and encryption. IMAP: port 993 (SSL). SMTP: port 587 (TLS). POP3: port 995 (SSL).
Test internet connectivity
Open a browser and visit your email provider's webmail. If webmail works but Outlook doesn't, it's an Outlook configuration issue, not internet.
Disable antivirus email scanning
Some antivirus programs scan emails and interfere with Outlook connections. Temporarily disable your antivirus or find 'Email Protection' / 'Mail Shield' in settings and turn it off.
Create a new Outlook profile
Control Panel > Mail > Show Profiles > Add > set up your email again. Set the new profile as default. This fixes corrupted profile issues.
Repair Outlook data file
Close Outlook. Navigate to C:\Program Files\Microsoft Office\root\Office16\SCANPST.EXE > Browse to your .pst or .ost file > Start > Repair.
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Frequently Asked Questions
What does error 0x80042108 mean?
Outlook can't connect to your email server to send or receive emails. The connection is being blocked, timed out, or configured incorrectly.
Why does Outlook work on phone but not PC?
Your phone may use different connection settings (like IMAP vs POP3) or a different network. Check that your PC's Outlook uses the same server settings as your phone's email app.
Can a firewall block Outlook?
Yes. Both Windows Firewall and third-party firewalls can block Outlook ports (993, 587, 995). Add Outlook.exe to your firewall's exception list.
What's the difference between POP3 and IMAP?
POP3 downloads emails to your device and deletes them from the server. IMAP syncs emails across all devices. For most people, IMAP is better — use port 993 with SSL.
How do I find my .pst file?
Outlook > File > Account Settings > Data Files tab. It shows the path to your .pst or .ost file. Default location: C:\Users\[name]\AppData\Local\Microsoft\Outlook\
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