Thank you for the post.
Uninstalling and reinstalling IIS was a great first step. Since the issue persists then a good next step would be to fully uninstall and reinstall FileMaker Server. First, backup the databases and trash the entire FileMaker Server folder before reinstalling.
Please let me know if afterwards the issue persists, and we can discuss next steps.TSFalconFileMaker, Inc.
Thanks. That worked!