Problems and solutions encountered when running and debugging local IIS

I encountered a problem by chance today, and I can’t figure out the cause! But I still want to record it. Only by recording bit by bit can we grow faster and better! Problem: As shown in the figure

, the IIS server runs normally, but this problem occurs when running and debugging the local IIS!

After debugging once with IIS Express, local IIS debugging returned to normal! I still don't understand what the problem is, I have never encountered a similar problem before! I am a newbie, if there are any experts who pass by, please let me know, thank you very much!

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