I have a problem with a Firebird database randomly locking up completely for a period of time sometimes only a 30 seconds, sometimes 10 or 15 minutes.
Version is 2.1.7
Server is new running Windows Server 2012 R2.
Only a smallish database with about 6 users.

We never had any problems when running on an old windows 2000 server.

firebird log file shows various errors, see below:


ALCOSERVER    Thu Mar 24 11:14:17 2016
    INET/inet_error: send errno = 10054


ALCOSERVER    Thu Mar 24 11:14:17 2016
    INET/inet_error: send errno = 10054


ALCOSERVER    Thu Mar 24 11:14:17 2016
    INET/inet_error: send errno = 10054


ALCOSERVER    Thu Mar 24 11:14:17 2016
    SERVER/process_packet: broken port, server exiting


ALCOSERVER    Thu Mar 24 11:14:17 2016
    SERVER/process_packet: broken port, server exiting


ALCOSERVER    Thu Mar 24 11:14:17 2016
    SERVER/process_packet: broken port, server exiting


ALCOSERVER    Thu Mar 24 11:14:17 2016
    INET/inet_error: send errno = 10054


ALCOSERVER    Thu Mar 24 11:14:17 2016
    SERVER/process_packet: broken port, server exiting


ALCOSERVER    Thu Mar 24 11:14:36 2016
    INET/inet_error: read errno = 10054

Hope someone can help.
thanks,
Richard.