By default, FIXICC connection timeout is 30 seconds.
In case if the establishing the connection takes much more time (e.g. with LDAP authentication) it is required to increase the timeout in fixengine.properties:
# Timeout interval in milliseconds. The parameter must be an integer and not negative. loginWaitTimeout = 120000
More info about FIX-engine parameters in FIXICC can be found here: FIX Antenna Java Configuration