How to understand "Detected a potentially dangerous value Request.Path"?

Hello!

Until yesterday everything was fine yesterday c in the log every minute began to crumble:

Detected a potentially dangerous value Request.Path received from the client "<"

not revealed that this was related to my edits, so I added in the web config: requestPathInvalidCharacters=""

now every minute error in the logs: Detected a potentially dangerous value Request.Path received from the client (="...nts/05

I think maybe someone is trying to hack and set up of the robot, added together with the error the IP address was preserved. See different alpiski other cities.... I have a website purely regional... and this error call requests from other cities, even much remote - I'll never know...

reason:
swears on the widget feed.mikle.com
July 9th 19 at 10:47

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