<s>
A	O
poison	B-Application
message	I-Application
refers	O
to	O
a	O
client	B-Operating_System
–	I-Operating_System
server	I-Operating_System
model	I-Operating_System
issue	O
,	O
where	O
a	O
client	O
machine	O
tries	O
to	O
send	O
a	O
message	O
to	O
the	O
server	O
and	O
fails	O
too	O
many	O
times	O
(	O
the	O
actual	O
amount	O
of	O
"	O
too	O
many	O
"	O
is	O
variable	O
)	O
.	O
</s>
<s>
The	O
behavior	O
toward	O
Poison	B-Application
messages	I-Application
varies	O
-	O
they	O
are	O
either	O
discarded	O
,	O
create	O
a	O
service	O
request	O
event	O
,	O
or	O
initiate	O
other	O
failure	O
indications	O
.	O
</s>
<s>
The	O
term	O
is	O
used	O
mainly	O
in	O
Microsoft-related	O
frameworks	O
,	O
like	O
SQL	O
Server	O
or	O
Windows	B-Application
Communication	I-Application
Foundation	I-Application
(	O
WCF	O
)	O
.	O
</s>
