During a scheduled scan in Symantec Endpoint Protection (SEP), the following error is observed on machines with insight look-up disabled:

• "Reputation check timed out during unproven file evaluation, likely due to network delays."

"Reputation check timed out during unproven file evaluation, likely due to network delays."

Bash sends events to SEP. 
SEP processes the event and queries the reputation of file.
If reputation query fails then this particular error message is logged in system log.

Currently SEP makes the decision whether to query the reputation in this particular flow only if Download Advisor in enabled in "Download Insight" Tab under  Virus & Spyware policy.
It does not check the state of Insight Lookup.

The issue will be fixed in next release.

Workaround: Symantec Support has confirmed that enabling "Allow Insight lookups for threat detection (recommended)" in External Communications Settings can be a workaround.