Paul Colby created QPID-4036:
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Summary: Failed client connections permanently exhausting broker's
max connections limit
Key: QPID-4036
URL: https://issues.apache.org/jira/browse/QPID-4036
Project: Qpid
Issue Type: Bug
Components: C++ Broker
Affects Versions: 0.16
Environment: CentOS release 5.5 (Final)
Linux 2.6.18-194.32.1.el5 #1 SMP Wed Jan 5 17:52:25 EST 2011 x86_64 x86_64
x86_64 GNU/Linux
gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-48)
Reporter: Paul Colby
Priority: Critical
I'm running a set of Qpid 0.16 C++ brokers with configuration like:
{code}
cluster-name="mm-queue-cluster"
cluster-cman=yes
cluster-mechanism=PLAIN
cluster-username=broker
cluster-password=abc123
cluster-url=ssl:gateway02:5671
auth=yes
ssl-cert-db=/etc/qpid/certs/broker
ssl-cert-password-file=/etc/qpid/certs/pass.txt
ssl-cert-name=broker.messagemedia.com.au
require-encryption=yes
{code}
ie the broker is requiring both encryption and authentication (configured SASL
mech list is CRAM-MD5 DIGEST-MD5 EXTERNAL PLAIN).
Now, if a client (let's use {{qpid-stat}} for example) connects via SSL (amqps)
and authenticates successfully, then everything is happy.
However, if a client repeatedly fails to use SSL and/or fails to provide
credentials, then the broker loses one of it's configured max connections every
time!
So, for example, if we start the broker using the configuration shown above,
then do this:
{code}for i in `seq 1 550`; do echo $i; qpid-stat -q ; done{code}
The above loop will report ~ 500 {{AuthenticationFailure}} errors, then switch
to {{ConnectionError}} errors. Once the {{ConnectionError}} errors begin, all
further connections to the broker will be rejected - permanently (until the
broker is restarted), with the broker logging:
{code}error Client max connection count limit exceeded: 500 connection
refused{code}
>From my testing, the following loops never cause an issue (with this
>configuration):
{code:none}
for i in `seq 1 550`; do echo $i; qpid-stat -b amqps://guest/guest@localhost -q
; done # Works as expected.
for i in `seq 1 550`; do echo $i; qpid-stat -b amqps://guest/wrong@localhost -q
; done # AuthenticationFailure as expected.
{code}
Whereas any of the following will break the broker:
{code:none}
for i in `seq 1 550`; do echo $i; qpid-stat -b amqp://guest/guest@localhost -q
; done # AuthenticationFailure, then ConnectionError.
for i in `seq 1 550`; do echo $i; qpid-stat -b amqp://guest/wrong@localhost -q
; done # AuthenticationFailure, then ConnectionError.
for i in `seq 1 550`; do echo $i; qpid-stat -b amqp://localhost -q ; done
# AuthenticationFailure, then ConnectionError.
for i in `seq 1 550`; do echo $i; qpid-stat -b amqps://localhost -q ; done
# AuthenticationFailure, then ConnectionError.
{code}
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