why my webhook server always get "connect timeout"?

i have a vps (debian installed),

i use it for get a webhook data from line API and facebook API. if i check my url from dashboard API, i always get notice “connect timeout”. my question is, how come my server get that notice? my webhook server still run normally untill january 9th, but after that, all of my webhook data from my line and facebook not receive in my server. how i trace it? any suggestion ?

thanks in advance

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