Error while establishing a connection to the licensing server

Curtis Chau

Updated: August 2, 2026

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  # Error while establishing a connection to the licensing server If you encounter the following message while trying to use IronPDF, it means the licensing server cannot be reached, and thus, IronPDF cannot retrieve the appropriate response to activate the library. ```txt IronPdf was unable to establish a connection to the licensing server. A valid internet connection is required for TEAM-type License Keys. In restricted environments, you need to whitelist https://licensingapimanager.azure-api.net. For projects that require offline air-gapped environments with unlimited devs, projects, and locations, please consider the Unlimited Enterprise License at https://ironpdf.com/licensing/?utm_source=errormsg. For help, please reach out to us at https://ironsoftware.com. ``` To resolve this, you must have an active internet connection, which allows IronPDF to establish a secure connection to the licensing server and obtain the library keys. Please double-check and validate the internet connection and that should resolve the issue. ## Connection Error Despite a Valid Internet Connection For users on recent versions of IronPDF, this error message can happen randomly at times, even if there is a valid internet connection. This is due to the licensing server having a timeout setup that sometimes times out the connection internally and thus throws the error message above. ## Solution If the above method of trying to validate whether there is an internet connection does not work, the alternative solution is to rerun the project on the application end to resolve this issue. We currently have plans to resolve this issue by removing the timeout lock mechanism away from the licensing server. Please be assured a fix will be released to address this issue.

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If you encounter the following message while trying to use IronPDF, it means the licensing server cannot be reached, and thus, IronPDF cannot retrieve the appropriate response to activate the library.

IronPdf was unable to establish a connection to the licensing server. A valid internet connection is required for TEAM-type License Keys. In restricted environments, you need to whitelist https://licensingapimanager.azure-api.net. For projects that require offline air-gapped environments with unlimited devs, projects, and locations, please consider the Unlimited Enterprise License at https://ironpdf.com/licensing/?utm_source=errormsg. For help, please reach out to us at https://ironsoftware.com.

IronPdf was unable to establish a connection to the licensing server. A valid internet connection is required for TEAM-type License Keys. In restricted environments, you need to whitelist https://licensingapimanager.azure-api.net. For projects that require offline air-gapped environments with unlimited devs, projects, and locations, please consider the Unlimited Enterprise License at https://ironpdf.com/licensing/?utm_source=errormsg. For help, please reach out to us at https://ironsoftware.com.

To resolve this, you must have an active internet connection, which allows IronPDF to establish a secure connection to the licensing server and obtain the library keys. Please double-check and validate the internet connection and that should resolve the issue.

Connection Error Despite a Valid Internet Connection

For users on recent versions of IronPDF, this error message can happen randomly at times, even if there is a valid internet connection. This is due to the licensing server having a timeout setup that sometimes times out the connection internally and thus throws the error message above.

Solution

If the above method of trying to validate whether there is an internet connection does not work, the alternative solution is to rerun the project on the application end to resolve this issue. We currently have plans to resolve this issue by removing the timeout lock mechanism away from the licensing server. Please be assured a fix will be released to address this issue.

Curtis Chau

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Technical Writer

Curtis Chau holds a Bachelor’s degree in Computer Science (Carleton University) and specializes in front-end development with expertise in Node.js, TypeScript, JavaScript, and React. Passionate about crafting intuitive and aesthetically pleasing user interfaces, Curtis enjoys working with modern frameworks and creating well-structured, visually appealing manuals.

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