Error: "Execute Commands failed" When Enabling AppFlow from NetScaler MAS

Enabling AppFlow from NetScaler MAS fails with the error message: Execute Commands failed. Config logs /var/mps/log/mpsconfig.log: Wednesday, 10 Jan 18 11:55:20.075 -0500 Error 1 SSH Command Timed out on Wednesday, 10 Jan 18 11:56:20.080 -0500 Error Main SSH: Failed to connect on Wednesday, 10 Ja...