Solved: Sudden untrusted server blocked error message with AnyConnect

Security and SD-WAN

If you have encountered the sudden untrusted server blocked error message while using Cisco AnyConnect, you're not alone. At Integrity Hotel Partners, we understand the importance of seamless network connectivity in the Business and Consumer Services - Real Estate industry. In this article, we will explore the causes of this error and provide you with expert solutions to overcome it.

Understanding the Error Message

When you encounter the sudden untrusted server blocked error message with AnyConnect, it usually indicates a problem with the SSL certificate verification process. This error occurs when the certificate presented by the server is either expired, self-signed, or untrusted by AnyConnect.

Possible Causes of the Error

There are several potential reasons why you may be receiving the untrusted server blocked error message. These include:

  • Expired SSL certificate: If the SSL certificate on the server has expired, AnyConnect will flag it as untrusted.
  • Self-signed certificate: AnyConnect requires certificates to be signed by a trusted certificate authority (CA). Self-signed certificates are not recognized as trusted.
  • Untrusted CA: If the CA that signed the certificate is not trusted by AnyConnect, it will result in the untrusted server blocked error message.

Solutions to the Error

1. Verify SSL Certificate

Firstly, ensure that the SSL certificate on the server is not expired. Check the certificate's validity period and ensure it is still valid. If the certificate has expired, you need to renew it through a trusted CA.

2. Obtain a Trusted Certificate

If you are using a self-signed certificate, it is recommended to obtain a certificate signed by a trusted CA. This will ensure that AnyConnect recognizes the certificate as trusted and eliminates the untrusted server blocked error message.

3. Validate the Certificate Authority

In some cases, the CA that signed the certificate may not be trusted by AnyConnect. In such situations, you can add the CA's root certificate to the trusted certificate store on your device. This will establish a chain of trust and resolve the untrusted server blocked error message.

4. Update AnyConnect

Ensure that you are using the latest version of Cisco AnyConnect. Older versions may have limitations or known issues that could trigger false untrusted server errors. Updating to the latest version can often resolve such issues.

Conclusion

At Integrity Hotel Partners, we understand the frustrations caused by the sudden untrusted server blocked error message with AnyConnect. By following the solutions outlined above, you can regain smooth network connectivity and eliminate this error. If you require further assistance or have any questions, feel free to reach out to our expert team. We are dedicated to providing reliable and efficient solutions to ensure uninterrupted connectivity in the Business and Consumer Services - Real Estate industry.

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