How to reproduce:
1. Open any project
2. Navigate to Analysis > Profiler (Standalone)
3. Close the Standalone Profiler
4. Observe Console
Expected result: No warning in Console
Actual result: "Sending message header failed (11)" Warning appears in Console
Reproducible with: 2020.3.34f1, 2022.1.3f1
Not reproducible with: 2021.3.2f1
Couldn't test with: 2019.4.39f1 (No Standalone Profiler), 2022.1.2f1, 2022.2.0a15 (Editor crashes upon opening Standalone Profiler (1371326))
Reproduced on: Ubuntu 18.04
Note: On 2020.3.34f1 reproduced with message ("Sending message header failed")