What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general.

Learn more

PRTG Network Monitor

Intuitive to Use. Easy to manage.
More than 500,000 users rely on Paessler PRTG every day. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free Download

Top Tags

View all Tags

Error Sending "SMS"



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?

notification prtg sms

Created on Aug 8, 2023 6:51:13 AM

1 Reply




We would need more information for further checking and analysis regarding this issue. Kindly raise a ticket to us by simply creating a ticket via the PRTG web interface by going to Setup | Contact Support.

Kind regards,
Muna Azmi - Tech Support Team

Created on Aug 15, 2023 9:12:06 AM by  Muna Azmi [Paessler Support]

Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.