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MAKE SURE YOUR APPLICATION BINDING IN YOUR IIS is set to All Unassigned IP ADDRESS
Run ngrok http 127.0.0.1:173 --region=eu --hostname=yourcustomdomain.eu.ngrok.io
THAT'S IT. WORKS PERFECTLY. THIS SOLUTION IS ALSO FOR PAID PRO ACCOUNTS
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ngrok http 8080 -host-header="localhost:8080"
ngrok http --host-header=rewrite 8080
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ngrok http 8080 -host-header="localhost:8080"
ngrok http --host-header=rewrite 8080
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ngrok http 8080 -host-header="localhost:8080"
ngrok http --host-header=rewrite 8080
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npm i ngrok -g
> ngrok http port
//if error invalid host header
//try
ngrok http port -host-header="localhost:port"