When changing Edge Gateway or VDC Network settings, the operation fails with an error similar to:
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"Networking Operation Failed: Configuration failed on NSX Edge VM [vm-952625]. Kindly refer Edge and NSX Manager logs for more details." 
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Root Cause: File system in read-only mode. Command execution failed. 
Solution
Redeploy the Edge Gateway. This process reinstantiates the underlying NSX Edge VM to resolve the read-only file system issue.
Important Considerations:
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Service Impact: During the redeployment, the Edge Gateway will be unavailable for management, and all network traffic passing through it will be interrupted. 
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Estimated Duration: The process typically completes within approximately 5 minutes. 

Steps to Redeploy
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Navigate to Networking in your portal. 
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Select the Edge Gateways tab. 
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From the list, select the checkbox for the affected Edge Gateway. 
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Click the Redeploy button. 
The system will now begin the redeployment process. Monitor the task progress to confirm when the operation finishes successfully.