Nothing, really, my Comodo some times have 20-100 a day, it does not mean that someone is trying to hack your PC.
I have these alerts suppressed, so I don't see them. Install Malware bytes and run the trial, it will make u paranoid even more, as it comments on blocked access.
Lower your alert messages level.
It basically is telling u that some website tried to connect to the PC and it was blocked.
Nothing more. No hackers.