CAPWAP: Retransmission count for packet exceeded

We are noticing that WLAN-APs with HREAP-setup are jumping between different remotely located WLCs.
The APs are LAP1131 and LAP1242 with IOS 12.4(21a)JHC and WLC 4402-50-K9 with 6.0.202-image
All starts with the following Log-entries in the WLAN-APs:
*Jan 24 08:22:50.036: %CAPWAP-3-ERRORLOG: Retransmission count for packet exceeded max (CAPWAP_ECHO_REQUEST., 1)
*Jan 24 08:22:50.036: %LWAPP-3-CLIENTEVENTLOG: Switching to Standalone mode
*Jan 24 08:22:50.040: %CAPWAP-3-ERRORLOG: GOING BACK TO DISCOVER MODE
*Jan 24 08:22:50.040: %DTLS-5-SEND_ALERT: Send WARNING : Close notify Alert to 163.157.1.101:5246
*Jan 24 08:22:50.088: %WIDS-6-DISABLED: IDS Signature is removed and disabled.
*Jan 24 08:22:50.090: %CAPWAP-5-CHANGED: CAPWAP changed state to DISCOVERY
*Jan 24 08:23:00.093: %CAPWAP-3-ERRORLOG: Selected MWAR 'SGOTWLC03'(index 1).
Who can tell me the reason for this behaviour ?
Is it possible to tune the CAPWAP-parameter retransmission count ?
Thanks in advance
Wini

Going to try to answer this a different way for anyone Googling this who needs an answer.
"Is it possible to tune the CAPWAP-parameter retransmission count?"
Yes. See here:
http://www.cisco.com/en/US/docs/wireless/controller/7.4/configuration/guides/consolidated/b_cg74_CONSOLIDATED_chapter_01110110.html
Browse to your WLC.
Choose "Wireless" from the top bar.
Under "Access Points" on the left, choose "Global Configuration."
In the main panel off to the right you will see "AP Retransmit Config Parameters" with 2 options: "AP Retransmit Count" and "AP Retransmit Interval."
AP Retransmit Count is how many times it will try to contact a WLC before failing. Maximum is 8.
AP Retransmit Interval is how long between each try. Maximum is 5.
(AP Retransmit Count) * (AP Retransmit Interval) = How long the AP can go without talking to a WLC, in seconds.
If you are using FlexConnect Local Switching and FlexConnect Local Auth, the AP SHOULD still be able to handle clients during this timeframe.
When an AP cannot contact a WLC...
Step 1.) When the retransmit count (max 8, with a max 5 second interval, so 40 seconds max) is exceeded, the AP goes into Standalone mode (similar to Autonomous) and tries to contact a WLC via its static IP for apprx 5 minutes.
Step 2.) If unsuccessful, the AP switches to DHCP, renews the DHCP lease (to get a new IP address) and tries again to contact a WLC for apprx 3 minutes. This repeats 3 times, for a total of apprx 9-10 minutes.
Step 3.) If after step 2 the AP could still not find a controller, the AP reboots itself and starts at Step 1 all over again. Reboot takes apprx 2-3 minutes.
Note if using DHCP addresses, the process may start at Step 2.
Yes, the maximum time an AP can be out of contact with its WLC then is 40 seconds. If you're just using CAPWAP to configure and reconfigure APs which are otherwise nearly autonomous, this can be quite the annoying level of neediness.
"Who can tell me the reason for this behaviour?"
I believe this behaviour is to ensure management capability, and also to support some of the more "interesting" (for lack of a better term) reasons for CAPWAP... maybe wireless client mobility, remote switching, remote authentication, etc. In those scenarios you DO want your APs to be "needy."
Message was edited by: Mark Withers - not mesh... -

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Best regards,
Claes
Attachments:
Configure Side Camera Flash 1 Triggering.vi ‏47 KB

Well you're welcome to do that--it will work just fine as long as you are configuring a start trigger.
<rant>
However, personally I really don't like putting multiple counter outputs in the same task. I have seen so many people assume that the counter outputs would be synchronized due to having them in the same task when this is not the case (you need to configure a start trigger in order to synchronize the counter outputs even if they are in the same task). This is the only case I can think of where multiple channels in a DAQmx task are not automatically synchronized.
As an example:
Running this on my PCIe X Series gives a measured 2 edge separation of 1 ms + {7.78 us - 10.11 us}. This would likely be much worse on a bus with more latency (e.g. USB).
The resulting output is close enough to what you might expect that it might go unnoticed, but really these counter outputs are not synchronized and it would be easy to glance at the code and not even think twice about it. For the small amount of extra work on my end to create a separate task for each counter, it really clears up some ambiguity about what the counters are actually doing. For me it's worth it.
So again, for your case there really isn't a problem with having the counters in the same task since you are using an external start trigger anyway. I have just gotten in the habit of avoiding doing this.
</rant>
Best Regards,
John Passiak

Message retry count for the message has been exhausted

Hi,
I am using 'Custom Document Over Internet' with HTTPS as transport protocol. I have set the acknowledgement mode to Sync in order to receive the synchronous response. B2B is able to post the HTTP request successfully and in turn it receives a synchronous response and a MDN message. At the initial stage, after posting the request it shows the state as 'WaitForAck' for request message and for response and MDN messages, the state is completed.
After some time when we check the state of request it is changed to 'Error' with the error message as 'Message retry count for the message has been exhausted'. We have not set the retry count and retry interval and so after retrying for 3 times with an interval of 120 minutes it is showing error state as it is not able to correlate the incoming response to the corresspoding request. We have tried the option of setting the Message id of the request in 'replyToMsgID' parameter of response header and tested the flow. But still I am facing te same issue. Please help me to resolve this issue.

Hi Anuj,
The property mentioned by NandaGopal has already been added in tip.properties file. I sent the B2B logs in debug mode and tip.properties file to your mail id. Please have a look into that. The result of opatch lsinventory command is
Result:
Installed Patch List:
=====================
1) Patch 9234704 applied on Fri Jan 15 16:41:12 GMT 2010
[ Bug fixes: 8870866 9143036 ]
[ This patch overlays patches " 8703410 " ]
[ This patch needs patches " 8703410 " as prerequisites ]
2) Patch 8703410 applied on Thu Jan 07 17:56:08 GMT 2010
Unique Patch ID: 11901808
[ Bug fixes: 7652646 7497854 7664370 8708445 7661101 7007789 6352814 6802446 7665607 7641078 6496457 6013963 8330151 7305413 8619657 7460584 7529893 7458954 7020996 8393885 8210401 6329207 6740403 7126458 6511970 8783577 7379065 7230993 8704965 6774631 7198642 8309511 8392729 7661769 7605518 7479148 6733262 8349002 6736026 7322333 7242500 7239355 8746561 8344645 8451004 7645440 6747966 6369424 6737334 8339176 6774134 7046561 6412124 7210461 7506319 8630406 8235175 7258882 7184318 6453359 7456866 7673646 6043277 7457597 6769895 7193710 8239170 7668247 8404955 8612841 7261965 7132740 7485790 6518386 7305363 6852370 6433256 7673431 6764239 8360048 7501748 7379153 8281019 7498031 8216457 7046574 6875312 6754906 6656289 6417367 7658271 7556011 7000190 6979467 8594506 8691820 6852308 8475848 8518443 7600385 7211208 6732051 8524862 7461051 8263026 7609467 7379161 7672714 6353293 7157229 7594997 7211287 7034069 7563311 6822375 6640935 7359202 6769261 6919593 8601869 6029507 6974391 7139013 7518641 8605719 6817264 7501903 7496014 7576785 8666761 7130151 7322581 5523563 7680097 8508905 7241737 7660780 8480395 7660781 7191994 6924921 7672723 8432093 6800745 8703404 8540335 8507242 8608121 8217566 7481317 6639030 6200414 7529795 7354853 8475867 7376270 7303860 7016005 7678901 7368610 8992520 6881977 6016128 7033061 6397084 7672730 8703410 7709562 6449656 7045589 8508054 6491068 7378745 7643811 7435853 7615836 8707416 6447557 7379042 6940476 7670634 6950383 6764273 6962327 7478322 8546454 7157324 8871403 8862082 7184219 7672744 7164618 7672745 7230184 7576730 7590301 8746541 7261863 8327427 6769430 8295683 7526186 8298731 6414280 6139955 6646997 7692853 8233048 6794296 7457066 8552373 8225241 7706387 7204022 ]
3) Patch 4601861 applied on Fri Nov 14 04:24:08 GMT 2008
[ Bug fixes: 4601861 ]

Play count for imported items

Here's a new one for me...
Starting with this latest version, when I burn a CD, it automatically marks the Play Count for those items at 1. Anyone else encounter this? Is there a fix?

i've noticed that sometimes the play count does not increase for songs, and the only workaround i've seen that works is to do a second sync after the first one completes.

CAPWAP: Retransmission count for packet exceeded

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