Author oscar Micheli
Good morning,
I have a recurring problem with firebird 2.5.4 running on Linux Ubuntu 14.04 LTS and 12.04 LTS.All of them are virtual machines operated by VMware 5 and I have vmware tools installed.After some days of correct operation the clients can't connect to the server or the connection hangs if it was established.Clients are windows applications.It seems that network connection are disabled, but a connection form the linux machine using isql-fb to the local database (using the full pathname of the feb) is working but using the network host:alias doesn't work.
The only way to restore a working system is to stop and restart the service (not the entire vm).The firebird log doesn't help. It just says how many connection were active when I stop and start the service.----

cicladi3db      Tue Oct 20 20:44:48 2015        Shutting down the server with 31 active connection(s) to 4 database(s), 0 active service(s)
cicladi3db (Client)     Tue Oct 20 20:44:51 2015        /usr/sbin/fbguard: /usr/sbin/fb_smp_server killed (did not terminate)
cicladi3db (Client)     Tue Oct 20 20:44:51 2015
        /usr/sbin/fbguard: guardian starting /usr/sbin/fb_smp_server
The problem is not related to the amount of work as often this happens when the system is not under heavy load (7 connection).Sometimes after 1 or 2 weeks and sometime after a few days no rule here too.
I can't find a log in the system that may help me in some way.
Before upgrading to 2.5.4 I was using the stock version 2.5.2 and I experienced the same problem but I was able to find a log somewhere in the system that informed me about some sort of recognised bug  in this version that caused the system to block (some sort of memory error in database pages).
Firebird is running in super classic mode.

root@cicladi3db:/etc/init.d# uname -aLinux cicladi3db 3.13.0-63-generic #103-Ubuntu SMP Fri Aug 14 21:42:59 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Under windows the same databases runs with no problem.
Attached my firebird.conf just in case.
Thanks for you help!

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