We had the SMS notification system up and running for over 3 years. This week all of a suddent the SMS are not sending and the error Error sending "SMS": Number=9999999999, Message=EIdHTTPProtocolException: HTTP/1.1 404 Not Found" is being logged.
We went on the physical server where the prtg core is installed and used postman/browser with same Custom URL which worked without any issues.
Can you kindly enlighten us what the issue is?
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