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Overview
The Microsoft Remote Connectivity Analyzer is a free, web-based diagnostic tool that helps IT administrators troubleshoot connectivity issues in Exchange Online, Exchange Server, Microsoft Teams, Microsoft 365 Copilot, and Skype for Business Server deployments.
The tool simulates client logon and mail flow scenarios from the internet and returns success, warning, or fail results with built-in guidance so you can identify and resolve issues without raising a support case.
Access the tool at https://testconnectivity.microsoft.com.
Note
The error articles in the Microsoft Remote Connectivity Analyzer documentation correspond to specific failure conditions surfaced by the tool. Apply the guidance in those articles only to systems on which the tool has run and only when the described error is present.
Warning
Government Cloud — Not supported The Remote Connectivity Analyzer does not currently support Microsoft 365 Government environments (GCC or GCC High). If you are a government cloud customer experiencing connectivity issues, raise a support request from the Microsoft 365 admin center or contact your Microsoft account team.
Prerequisites
Before running a test, confirm the following requirements are met:
You have an IT administrator account with sufficient permissions to authenticate against the service you are testing.
Your firewall or network perimeter allows inbound connections from the tool's dedicated IP addresses.
You are using a supported browser: Microsoft Edge, Google Chrome, or Mozilla Firefox (latest stable release recommended).
Allow inbound access from Remote Connectivity Analyzer IP addresses
The tool initiates tests from the internet and must be able to reach your environment inbound. The Remote Connectivity Analyzer uses a dedicated set of IP addresses that are separate from the standard Microsoft 365 service endpoints documented in Microsoft 365 URLs and IP address ranges . Configure your environment to allow inbound access from all the following addresses.
- 72.152.19.128
- 72.152.19.129
- 4.237.88.238
- 4.237.88.239
- 2603:1030:10:e::6cc
- 2603:1030:10:e::6cd
- 2603:1010:6:8::514
- 2603:1010:6:8::515
Tip
If tests fail immediately with no meaningful error detail, a firewall rule is likely blocking inbound traffic from these IP addresses. Verify your allowlist, then re-run the test.
Supported technologies
Select a technology area to go directly to its test suite in the Microsoft Remote Connectivity Analyzer.
How to run MRCA diagnostic test
Follow these steps to run a diagnostic test.
Open a web browser and go to testconnectivity.microsoft.com .
Select the technology area that matches your issue — for example, Exchange Online, Microsoft Teams, or Copilot.
Choose the specific diagnostic scenario you want to run. Each technology area offers multiple scenarios.
Enter your user ID (typically your work or school email address) when prompted.
Authenticate with your credentials. If your account has multifactor authentication (MFA) enabled, enter the verification code when prompted.
Select Perform Test to start the diagnostic run.
Review the results. Where a step shows a Warning or Fail status, expand the detail section to view inline troubleshooting guidance and links to resolution articles.
Note
If a test passes but the issue persists in your environment, the problem may be client-side, network-path specific, or intermittent. In these cases, download the result html generated at the top right of the test run and include it when you raise a support request through the Microsoft 365 admin center.
Understand diagnostic results
Each test step returns one of the following statuses:
| Status | Meaning |
|---|---|
| Success | No issue detected. |
| Warning | Review the warning detail and follow the proposed action. |
| Fail | Follow the troubleshooting action plan in the guidance to resolve. |
Next steps
Check service health first: Before running connectivity tests, verify whether a known service incident is affecting your workload by checking the Microsoft 365 Service Health dashboard .
Review full network requirements: Ensure your environment meets all connectivity requirements in Microsoft 365 URLs and IP address ranges.
Escalate to Microsoft Support: If tests pass but the issue persists, or you need help with interpreting results, open a support case from the Microsoft 365 admin center and include your html with the result.