Description

This article explains the following syslog messages:

Jun 18 22:29:26.955  labbox fpc3 read failed (posix_interface_read): Resource temporarily unavailable
​Jun 18 22:41:29.558  labbox fpc3 read failed (posix_interface_read): Need authenticator

Symptoms

These syslog messages are seen sporadically without any time pattern. They map to the linux errno -- EAGAIN, which is not treated as an error, but an unsuccessful read at that instance.

Jun 18 22:29:26.955  labbox fpc3 read failed (posix_interface_read): Resource temporarily unavailable
​Jun 18 22:41:29.558  labbox fpc3 read failed (posix_interface_read): Need authenticator

Solution

  1. You can safely ignore these log messages as they are harmless and has no service impact.

    Or

  2. Add them to allowlist if they appear too frequently.

    Or

  3. Suppress the messages using KB9382 - How to prevent syslog messages from being written to the log file [juniper.net] .