Agent will not install error: The client and server cannot communicate, because they do not possess a common algorithm

Last Modified

Tue Mar 14 12:30 GMT 2023

Description

  • Agent install fails, logging contains the error: The client and server cannot communicate, because they do not possess a common algorithm.
  • TLS1.0 is disabled in .NET on the system.

Environment

  • N-able N-central 11.0 and higher

Solution

  • On an agent device, .Net Framework by default uses TLS 1.0 to communicate with N-able N-central server, when TLS 1.0 has been disabled on these device, this error message could show up during agent installation:
  • The client and server cannot communicate, because they do not possess a common algorithm.
  • There are two solutions available to fix this issue:
1. Re-enable the TLS 1.0 on the device
Or
2. Enable TLS 1.2 in .Net and then force .Net to use TLS 1.2, details in the article below:
  • How To Force .NET to use TLS 1.2

Also see: Preparing Agents and Probes for communicating over TLS1.2 with Modern Security Profile or Agent/Probe not checking in