Anti-malware solutions may display a detection name known as IDP.ALEXA.51. This is a generic detection name used by various different cybersecurity companies. According to reports, the detection of IDP.ALEXA.51 does not always mean that there is a threat or a suspicious activity present on your system. In fact, it would appear that the IDP.ALEXA.51 alert is often a false positive. Some users have reported that they are displayed with the IDP.ALEXA.51 alert when they are attempting to launch a genuine torrent service or run a legitimate copy of a popular video game. Clearly, these are false positives, as genuine applications would not pose a threat to your system's security or health. Platforms like BattleNet or Steam would not allow unsafe content on their platforms, so users who get the IDP.ALEXA.51 alert after installing a game from these sites should not worry about the state of their systems.
However, if the IDP.ALEXA.51 alert is associated with an unknown process, do not ignore it. In this case, it is best to scan your system with the help of a genuine anti-virus application that will locate and eliminate the issue.
If you have tried to download an 'activator' for Microsoft Office applications, you may get the IDP.ALEXA.51 alert. It is important to remember that downloading illicit content such as the activator in question is never a good idea and it may land you in a lot of trouble.