This appears to occur under very specific circumstances. There is a KB and it is also noted Log Insight's troubleshooting section of their documentation.
Rather than regurgitate all the same information is here is the gist:
- Occurs when log insight services are restarted
- Affects ESXi 5.0.x/5.1.x when using TCP and 5.0 U1 and earlier over UDP.
- Does not affect 5.0 U2 and newer when using UDP.
|Communication Protocol||Affected ESXi Version|