Accurate Diagnostic Messaging for Front Server Login Failures in Network Intent

NetBrain currently displays diagnostic messages during Network Intent execution that can misrepresent a Front Server login failure as an actual network error, since the message wording does not distinguish between a connectivity issue and an authentication failure. This enhancement would refine the error handling logic so that login failures are clearly identified and labeled separately from genuine network-level errors. Providing accurate, distinct diagnostic messaging would reduce troubleshooting time and prevent misinterpretation of the true network state.