I agree with the views expressed by Mr. TS. Since you are already in a job, the prospective employer would test your experience in most cases, rather than your academics (in companies where there is no restriction on the number of attempts that you had taken). However, in interviews, this topic may surface in the open discussion. It is good to tell the truth and a valid reason if you have one. So forget the past, prepare well, and concentrate on how best you can perform. As the years pass by, the relevance and proficiency of your expertise will count in your favor and nullify the mild stigma.
Good luck.
Regards,
V. Raghunathan
Navi Mumbai