Subject Re: Firebird: "Connection forci bly closed"
Author Adam
--- In, Dennis McFall <dennis@a...>
> We have the same Windows application running at about a dozen
> completely independent sites, with a variety of hardware. Client
> workstations (from 5 to 25 workstations) connect to the Firebird server
> at the site; some are on Windows servers, some on Linux. The app is
> running on Windows and Novell networks. Some of the sites have been
> active for 5 years. We use IP addresses in the connection string, not
> server names.
> Now we have a new installation site, with the database on Linux;
> network. In every (client) case, after about ten minutes of inactivity,
> the next attempt to access the database (query, update, etc.)
results in
> this error message:
> ---------------------------------
> ISC ERROR CODE: 335544721
> Unable to complete network request to host "". [This
> a real IP address for us; edited for privacy]
> Error reading data from the connection.
> An existing connection was forcibly closed by the remote host.
> ---------------------------------

As you correctly identified, the connection has been broken. IIRC,
there is no timeout parameter specific to Firebird, so it is either a
network issue, or some UDF call is crashing the server. Check the
Firebird log to see if it has been restarting itself. It would not
surprise me if this is the case considering it is your first Linux
install. Might be obvious, but make sure there is no "power save"
setting that could be doing this.


> I have reviewed about 100 Google hits for this message, and it the
> problem seems to be hard to track down, although it obviously has to do
> with the connection being closed by the O/S, sometimes in a "time-out"
> kind of behavior. But I wanted to be sure whether there is anything in
> Firebird or its configuration along the lines of "keepalive" or
> "timeout" or anything else that might contribute to this problem? Any
> ideas about why the connection is begin lost?
> TIA,
> Dennis McFall