RE: TCP/IP HTTP fault tolerant connection ending via ISA server
- From: "Alexandre Gauthier" <gauthiera@xxxxxxxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Thu, 2 Mar 2006 09:41:34 -0500
I'd like to corroborate, I observed this behaviour as well.
-----Message d'origine-----
De : David Farinic [mailto:davidfa@xxxxxxx]
Envoyé : 2 mars 2006 09:29
À : [ISAserver.org Discussion List]
Objet : [isalist] TCP/IP HTTP fault tolerant connection ending via ISA server
http://www.ISAserver.org
[WebServer] http connection-> Reset(RST) [ISA] ->FIN! [Web Client]
Observed consequences:
-When posting to web forums with HTTP POST and reply from webserver is
for some internet spaghetti reason broken, ISA gets tcp ip http
connection ending with RST ISA translates it to web client behind
it as FIN ... which leads to web clients believing they got data
correctly completely!
On web forums this results in double posting (as users don't see
their reply).
-AV updating services might not update their signature databases on
time.
This might cause potential problem with web-services and other
communication utilizing HTTP protocol.
REASON: Web applications reports wrong data retrieval only if TCP/IP
carrying http ends with Reset(RST) packet.
WORKAROUND: adding data integrity checking into data/sub-protocol
utilizing http carrier.
Tested on ISA2k4 and ISA2k:
With Kind Regards David Farinic.
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