The problem you’re facing is a common headache for IT pros. Your Outlook clients can’t connect outside the company network, and that’s a big deal. Let’s break it down and fix it.
The test results show the main issue: RPC over HTTP connectivity failed due to RPC Proxy can’t be pinged, indicating an issue with accessing emails outside the company network. Here’s what’s likely going on:
- Your Exchange server isn’t properly configured for external access.
- The RPC proxy settings might be incorrect.
- There could be firewall issues blocking the connection.
To resolve this, ensure the following:
Table of Contents
Check Exchange server configuration
- Ensure Outlook Anywhere is enabled.
- Verify that RPC over HTTP is enabled.
- Verify the external host name is set correctly.
Review RPC proxy settings
- Confirm that the SSL certificate is valid and properly configured on the Exchange server.
- Confirm the correct authentication methods are in place.
Firewall configuration
- Check firewall settings to allow incoming connections on port 443 for HTTPS traffic.
- Verify that the necessary URLs are allowed through.
Test internal connectivity first
- If it works internally but not externally, focus on your firewall and DNS settings
Double-check DNS records
- Ensure your external DNS points to the correct public IP
Verify using Microsoft Connectivity Analyzer
Ensure that the Microsoft Connectivity Analyzer can probe the TCP endpoint on port 443 to detect enabled protocols and cipher suites.
Additionally, review your server’s modern TLS protocols and cipher suites compatibility. The Microsoft Connectivity Analyzer should successfully obtain the remote SSL certificate.
Optimize remote access
- Configure Outlook Anywhere (RPC over HTTP) to enable external connectivity without VPN.
- Verify that the Exchange server’s external URL is accessible from the internet.
- Ensure that the necessary DNS records (e.g., AutoDiscover, OWA) are properly configured and pointing to the correct IP addresses.
By addressing these key areas, you’ll be well on your way to providing seamless Outlook access to your clients, empowering them to stay connected and productive, no matter where their work takes them.