TensorBoard has received multiple reports of this even in the browser, so this impacts all TensorBoard users, not just VS Code TensorBoard users.

We have documented how to diagnose and fix this problem: https://github.com/microsoft/vscode-python/wiki/Troubleshooting-TensorBoard-integration-in-VS-Code#integrated-tensorboard-sessions

TensorBoard added a workaround for it that ships with the source code. tensorflow/tensorboard#3128

For whatever reason that's not working and is still hitting our customers on Windows. Ideas:

1. Revisit the fix upstream. Maybe more is needed?
2. Check for and overwrite bad Windows registry values ourselves.