If the error persists on your local machine, your stored connection data might be corrupted. Open .
If these quick checks don't resolve the issue, move on to the more detailed troubleshooting steps below.
Restart the Remote Desktop Service (using the command in Quick Fixes) to trigger Windows to generate a new certificate. www.remoteaccesspcdesktop.com 2. Fix Certificate Corruption (Azure VMs) For Azure Virtual Machines, a corrupt MachineKeys folder can prevent RDP from functioning. www.remoteaccesspcdesktop.com In the Azure Portal, go to your VM and select Run command RunPowerShellScript and enter:
Ensure that port (the default port for RDP) and port 443 (if using an RD Gateway) are allowed. If the error persists on your local machine,
Here is a comprehensive guide to getting your connection back online. What Causes Error 0x904 (0x7)?
If it does, create an explicit inbound and outbound rule in your security software to allow the Remote Desktop application. 📌 Conclusion
RDP uses both TCP and UDP packets. If a router or VPN drops the UDP packets during the handshaking phase, error 0x904 occurs. Switching to TCP fixes this stability issue. Press Windows Key + R , type gpedit.msc , and press Enter . Restart the Remote Desktop Service (using the command
Packet loss, high latency, or brief drops in internet connectivity can cause the RDP session to time out during the initial handshake.
This is a broad connection failure code. It typically indicates that the client initiated a connection attempt, but the session was abruptly terminated or could not be completed at the protocol level.
Understanding these potential causes is the first step toward a solution. Now, let's move on to the most effective troubleshooting methods to fix the error. poor VPN throughput
While the official Microsoft RDP protocol documentation (MS-RDPBCGR) doesn't provide a specific mapping for the 0x904 error code, community research and technical analysis indicate its most common root cause: The connection is interrupted right before or during the essential security handshake between your local client and the remote server. This often manifests as a issue. To better understand what might be causing this, let's categorize the issues and explore how to fix them.
The client and host fail to agree on a mutually compatible encryption protocol or TLS cipher suite.
: High packet loss, poor VPN throughput, or restrictive WAN links can cause the handshake process to time out (which typically triggers after 23–25 seconds).
Log into the target remote computer locally or via an alternative management console.