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Re: connection dropping

From: bill <billmac333(at)comcast(dot)net>
To: fmonkey(at)fmonkey(dot)net
Cc: pgadmin-support(at)postgresql(dot)org
Subject: Re: connection dropping
Date: 2003-10-16 17:48:17
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgadmin-support
Thanks for the offer.
I am NAT'd behind a D-Link router connected to the cable modem. I am on 
the Comcast network.
I have noticed occasionally that my SSH connections will die off even 
though I have putty set to do 60 second keep-alives (I'm assuming that 
it really is). It usually isn't a problem though. If they go down, it is 
usually after quite an idle period.
Perhaps SSH connections are more tolerant of burps in connectivity than 
pgSQL connections?

fmonkey(at)fmonkey(dot)net wrote:

>>I love pgAdmin III. I use it when working at home. I'm stuck with II at
>>work since my machine is W98, although it (II)has a feature I prefer
>>over III. Anyway, here on the homefront, I'm connected via high-speed
>>cable connection (1.5 meg). I get excellent performance, however, I find
>>that pgAdmin drops the DB connection rather quickly if there is no
>>activity. If I leave the interface for any amount of time, when I come
>>back and click on anything, I get the error message:
>>"An error has occurred:
>>server closed the connection unexpectedly
>>    This probably means the server terminated abnormally before of while
>>processing the request."
>>After this I usually have to click through many dialog boxes telling me
>>that there is no connection to the server.
>>If I look at the process list in the DB server, I can see all the
>>connections I have made over a period just sitting there 'idle'.
>>There is nothing in the log that corresponds with the drop that I can
>>tell except with the possibility of:
>>LOG:  pq_recvbuf: recv() failed: Connection reset by peer
>>,but these may be from other clients.
>>What can I do to maintain the connection even if its idle?
>I don't know how much help I can be, but I'll see if I can give you some
>suggestions, or things to look at, to at least isolate the problem.
>Do you experience this with other applications?  I.e., if you open a ssh
>connection to a server, and leave it sitting for a while, does the session
>The odds are good that the problem here is that a router or firewall (most
>likely a firewall) between you and the database server is killing your
>connection, but not telling the server about it.  This happens quite a bit
>to me behind NAT'ing firewalls.  OTOH, behind my NAT'ing linksys cable
>router at home, my connections never time out, even if I leave them up for
>We've had the discussion before about adding support to pgAdmin3 for
>trying to keep connections alive through bad firewalls, but we've come to
>the conclusion that there isn't a "good" way to do this in the
>application, and that these sort of network problems are better solved by
>the end-user, not the application, since they are likely to affect lots of
>applications, not just pgAdmin3.
>If you can provide me some further information about your network setup,
>maybe I can give you some suggestions for trying to fix it that way.

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Subject: Re: connection dropping
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