On 2017-06-23 01:52, Aldo Caruso aldo.caruso@...
[firebird-support] wrote:

> Hi,
>
> I have Firebird 2.5 running since many years under the following
> environment
>
> OS: Ubuntu 14.04 Server
>
> Firebird Superserver 2.5.2.26540
>
> Web server: apache2 2.4.7
>
> Today connections from local PHP scripts could not be established.
> I tried to attach from Flamerobin.
>
> The error message was the following
>
> Context: Database::Connect
> Message: isc_attach_database failed
>
> SQL Message : -923
> Connection not established
>
> Engine Code : 335544421
> Engine Message :
> connection rejected by remote interface
>
> I had to restart Firebird in order to let clients connect.
>
> Any clue will be welcome.

I'd start by upgrading Firebird to at least 2.5.3 security update 1 from
December 2014 (but preferably 2.5.7 from February 2017), earlier
versions have a bug where a malformed packet can crash the server, which
might be the problem here.

Mark