Why is my REST-based WCF service refusing connections on port 3446?

Error: "The target machine actively refused the connection 127.0.0.1:3446"

This error prevents connecting to a REST-based WCF service designed for file uploads via streams.

Troubleshooting Steps:

The "actively refused" message points to a network or service issue, not a coding problem. To resolve this:

1. Service Verification: Confirm the service is running and listening on port 3446. Use netstat -anb (Windows) or ss -tulnp (Linux) to check listening ports.
2. Firewall Check: Temporarily disable your firewall to rule out port blocking. If the error persists, the firewall is not the cause.
3. Service Implementation Review: Ensure your service correctly handles incoming file streams.
4. Simplified Upload Test: Create a small test file and attempt a simpler upload method (e.g., writing to disk first, then uploading as a regular file). This isolates the stream handling.
5. Stack Trace Analysis: Carefully examine the full stack trace to pinpoint the exact connection failure point.

Potential Causes of Connection Refusal:

• Firewall Interference: The firewall might be blocking port 3446.
• Antivirus Conflict: Antivirus software could be interfering with the connection.
• Service Inactivity: The service may not be running or correctly bound to the port.
• Network Misconfiguration: A network configuration problem could be at fault.

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