Merge pull request #278601 from alt-key/patch-4

Update troubleshoot-resource-bridge.md

Author: prmerger-automator[bot]

articles/azure-arc/resource-bridge/troubleshoot-resource-bridge.md

@@ -55,7 +55,12 @@ This error typically occurs when trying to download the `KVAIO` image (400 MB co
 ### Context timed out during phase `WaitingForAPIServer`
 When deploying Arc resource bridge, you may receive the error: `Deployment of the Arc resource bridge appliance VM timed out. Please collect logs with _az arcappliance logs_ and create a support ticket for help. To troubleshoot the error, refer to aka.ms/arc-rb-error   { _errorCode_: _ContextError_, _errorResponse_: _{\n\_message\_: \_Context timed out during phase _WaitingForAPIServer`
 
-This error indicates that the deployment machine is unable to contact the control plane IP for Arc resource bridge within the time limit. Common causes of the error are often networking related, such as communication between the deployment machine and control plane IP being routed through a proxy. Traffic from the deployment machine to the control plane and the appliance VM IPs should not pass through proxy even if there is one. Another cause for this error is if a firewall is closing access to port 6443 and port 22 between the deployment machine and control plane IP or the deployment machine and appliance VM IPs.
+This error indicates that the deployment machine is unable to contact the control plane IP for Arc resource bridge within the time limit. Common causes of the error are often networking related, such as communication between the deployment machine and control plane IP being routed through a proxy. Traffic from the deployment machine to the control plane and the appliance VM IPs must not pass through proxy. If traffic is being proxied, then configure the proxy settings on your network or deployment machine to not proxy traffic between the deployment machine to the control plane IP and appliance VM IPs. Another cause for this error is if a firewall is closing access to port 6443 and port 22 between the deployment machine and control plane IP or the deployment machine and appliance VM IPs.
+
+### `UploadError` 403 Forbidden or 404 Site Not Found
+When deploying Arc resource bridge, you may receive the error: `{ _errorCode_: _UploadError_, _errorResponse_: _{\n\_message\_: \_Pre-deployment validation of your download/upload connectivity was not successful. {\\n  \\\_code\\\_: \\\_ImageProvisionError\\\_,\\n  \\\_message\\\_: \\\_403 Forbidden` or `{ _errorCode_: _UploadError_, _errorResponse_: _{\n\_message\_: \_Pre-deployment validation of your download/upload connectivity was not successful. {\\n  \\\_code\\\_: \\\_ImageProvisionError\\\_,\\n  \\\_message\\\_: \\\_404 Site Not Found`
+
+This error occurs in the deployment process when images need to be downloaded from Microsoft registries to the deployment machine and the download is being blocked by a proxy or firewall. Review the [network requirements](network-requirements.md#general-network-requirements) and verify that all required URLs are reachable. You may need to update your no proxy settings to ensure that traffic from your deployment machine to Microsoft required URLs are not going through a proxy.
 
 ### Arc resource bridge is offline