You can perform a reset of your iDRAC without having to power down your server if you receive the following error and SSH doesn't work for you.

"RAC0218: The maximum number of user sessions is reached."

This is a know issues for iDRAC firmware 1.50.50, 1.51.51, 1.51.52, 1.55.55 & 1.56.55.

Remember to update your firmware once you have access to your iDRAC again.

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