I think, I found the problem.

Yesterday, I installed again another OS on Virtual Box, then do some network setting on this new OS.

And then, suddenly, my previous CentOs 6.3 installation that has problem with firebird's connection became fix by it self.

I think, the problem is from Virtual box, may be it still has a bug, though I already use latest version.

Sugi

--- In firebird-support@yahoogroups.com, Steve Wiser <steve@...> wrote:
>
> For the telnet issue:
>
> You need to make sure you are overriding the default telnet port of 23 with
> the firebird port of 3050
>
> "telnet <ip address> 3050" should let you test to see if that port is
> accessible and listening.
>
> -steve
>
>
> On Mon, Nov 12, 2012 at 8:36 PM, trskopo <trskopo@...> wrote:
>
> > **
> >
> >
> > Hi Baskin,
> >
> > Thanks for your reply.
> >
> > I have disable Windows Firewall, and tried to telnet that port on Win 7,
> > it failed, it seems, unable to connect, but there are few things that I
> > don't understand :
> > 1) I have another OS running as guest via Virtual Box, this time the OS is
> > Windows XP 32bit, firebird 2.5.1 (32bit) superserver
> > 2) I installed again a new CentOS 6.3 (via Virtual Box), firebird
> > 2.5.2(64bit) superserver
> >
> > Both OS (WinXp and new CentOS) failed on telnet, error msg 'Could not open
> > connection to the host on port 23', but firebird on these OS works ok.
> >
> > File system on new CentOs is ext4, while on old CentOS is ext3.
> >
> > I have tested firebird perf on new CentOS with ext4 and is is bad, even
> > with barrier setting set to off.
> >
> > I can install again CentOs with ext3, but before I do that, if possible, I
> > would like to find out what is the problem in my old CentOs with ext3 ?
> > Finding problem might help me / other when face sam problem.
> >
> > Sugi
> >
> >
> > --- In firebird-support@yahoogroups.com, "btapkan" <baskint@> wrote:
> > >
> > > Sugi,
> > >
> > > Can you telnet to that port on Windows 7? If not, your Windows-7
> > firewall can be the culprit. To check, simply disable the port and re-try
> > telnet and connection. If successful, you can add port exceptions to your
> > firewall and turn it back on.
> > >
> > > Hope this helps,
> > >
> > > Baskin
> > >
> > > --- In firebird-support@yahoogroups.com, "trskopo" <trskopo@> wrote:
> > > >
> > > > Hi all,
> > > >
> > > > I have installed Firebird 2.5.2(64bit) Superserver on CentOS 6.3 (64
> > bit).
> > > >
> > > > This CentOs server running on Virtual Box as a guest system. Host
> > system is Win 7 64 bit.
> > > >
> > > > I can ping server's ip address but failed to connect to Firebird via
> > flamerobin installed on Win 7.
> > > >
> > > > I got an error message : 'Unable to complete network request to host
> > xxx. Failed to establish a connection'
> > > >
> > > > I have check that firebird server is running and listening on port
> > 3050 on CentOs. (using command via terminal-> ps aux|grep fbserver and
> > netstat -an | grep 3050).
> > > >
> > > > Firewall on CentOS also disabled.
> > > >
> > > > Did I miss something here?
> > > >
> > > > Thanks and regards,
> > > > Sugi.
> > > >
> > >
> >
> >
> >
> > This message and any files transmitted with it may contain information
> > that is privileged, confidential, and exempt from disclosure under
> > applicable law. They are intended solely for the use of the intended
> > recipient. If you are not the intended recipient, distributing, copying,
> > disclosing, or reliance on the contents of this communication is strictly
> > prohibited. If this has reached you in error, kindly destroy this message
> > and notify the sender immediately. Thank you for your assistance.
> >
> > We attempt to sweep harmful content (e.g. viruses) from e-mail and
> > attachments, however we cannot guarantee their safety and can accept no
> > liability for any resulting damage. The recipient is responsible to verify
> > the safety of this message and any attachments before accepting them.
> >
>
>
> [Non-text portions of this message have been removed]
>