Hello John,
Generally i would request during the time of this error, which looks like it occurred between 4:30pm to 5pm.
(or when it does occur).
Please go to GUI > System Admin > LDAP
Test connection to your LDAP servers
Then test the LDAP accept queries as well.
Possibly there was a slight network interruption causing the LDAP queries to not get a response within 20 seconds and thus generated these app faults during this time frame.
If all connection are fine, then alerts should be safe to ignore, however it happens frequently during specific time frames, I would strong suggest to consult your network team or run the tests to see what may be interrupting the LDAP queries.
Regards,
Matthew