AP periodically dropping his connection to WLC

Hello ,
I have problem with AP 1262 witch periodically lose his connection to the controller.
I have this situatuion. One WLC 5508 and two 1242 dual band controller based APs.One AP 1242 is connected to the controller through fiber link.The other AP1242 is connected to WLC through first AP on 5GHz Wireless Backhaul.First one is RootAP and second one is MeshAP.WIreless link between two APs have SNR=40dB and distance is no more than 30 metres(100 feet).Antennas used in this case is directioanl 5GHz "AIR-ANT5160NP-R" with gain 6dBi.
MeshAP have an IP and have alreaday downloaded IOS image and configuration from WLC. MeshAP is working fine when he si connected with WLC , and client can gain access two WLAN.
However the MeshAP is periodically dropping his connection to WLC.(once every 4-5 hours).
This is part of the log generated by the WLC before loosing connection with MeshAP:
*apfReceiveTask: Dec 01 10:41:08.199: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg
*spamApTask1: Dec 01 10:37:54.022: %CAPWAP-3-ECHO_ERR: capwap_ac_sm.c:5416 Did not receive heartbeat reply; AP: 00:08:30:70:97:70
*apfReceiveTask: Dec 01 08:47:30.943: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg
*spamApTask1: Dec 01 08:43:56.610: %CAPWAP-3-ECHO_ERR: capwap_ac_sm.c:5416 Did not receive heartbeat reply; AP: 00:08:30:70:97:70
*apfReceiveTask: Dec 01 07:28:50.498: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg
*spamApTask1: Dec 01 07:25:38.994: %CAPWAP-3-ECHO_ERR: capwap_ac_sm.c:5416 Did not receive heartbeat reply; AP: 00:08:30:70:97:70
*apfReceiveTask: Dec 01 06:28:26.299: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg
*spamApTask1: Dec 01 06:25:02.186: %CAPWAP-3-ECHO_ERR: capwap_ac_sm.c:5416 Did not receive heartbeat reply; AP: 00:08:30:70:97:70
*apfReceiveTask: Dec 01 00:07:47.769: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg
*spamApTask1: Dec 01 00:04:39.750: %CAPWAP-3-ECHO_ERR: capwap_ac_sm.c:5416 Did not receive heartbeat reply; AP: 00:08:30:70:97:70
*apfReceiveTask: Nov 30 17:05:40.975: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg
*spamApTask1: Nov 30 17:02:23.102: %CAPWAP-3-ECHO_ERR: capwap_ac_sm.c:5416 Did not receive heartbeat reply; AP: 00:08:30:70:97:70
*apfReceiveTask: Nov 30 07:08:58.755: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg
*spamApTask1: Nov 30 07:05:28.818: %CAPWAP-3-ECHO_ERR: capwap_ac_sm.c:5416 Did not receive heartbeat reply; AP: 00:08:30:70:97:70
*apfReceiveTask: Nov 30 04:09:30.046: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg
*spamApTask1: Nov 30 04:06:12.370: %CAPWAP-3-ECHO_ERR: capwap_ac_sm.c:5416 Did not receive heartbeat reply; AP: 00:08:30:70:97:70
*apfReceiveTask: Nov 29 19:04:58.763: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg
Any help would be appreciated.Thanks in advance.

Why are you using 802.11a as a backhaul? 802.11a may have the speed but the range of the 802.11a is not good. Now you said that you are using the 5060NP-R antenna on the 1260 side, now what antenna is being used by the RootAP?

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Downstream:
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Upstream:
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2.) What is happening when the TC backup operation stops functioning and hangs up the MBA's internet connection? (I see lots of messages logged in the system log when this happens; but, of course, I don't have much of a clue of which ones are normal and which are not normal. I could send a copy of the logs when it happens next (I am assuming it will).
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It seems pretty clear to me from my own experiences and the discussion reports of others that the disconnect problem lies in the MBA's wireless internet connection software or the configuration of it. It seems like it is having difficulty recovering from various wireless connection "mishaps".

Folks, I was having a very similar problem for the last 6 months. My connection was fine until June 2008, after which my Macbook and my Time Capsule would constantly conflict. If I rebooted or reset the TC, or the MB, things would be fine for a few minutes or sometimes a few hours and the problem would recur soon thereafter. About a month ago, I had to do a clean reinstall and the problem vanished for about 5 days, after which it reappeared. My MB never had a problem at work, or at someone else's home or with other routers, only with TC. Apple sent me a new TC, then they replaced my Airport card but the situation did not change ... UNTIL ABOUT AN HOUR AGO.
An hour ago, I called Apple for the nth time in the last 6 months, and the rep heard me out (just like the previous n-1 reps). He then asked me to to System Preferences --> Accounts --> Login Items and asked if Real Player Downloader showed up in my list. Indeed it did. He asked me to remove it, and told me that Apple had just figured out that the Real Player downloader was recently found to be causing a drop in the connection between Macbooks and the TC (as well Airport Express).
The problem I've been having baffled everyone. All the previous reps, the guys at the Genius Bars, nobody had a clue. Joe (the rep I spoke with this morning) seemed very confident that the removal of the Real Player Downloader from the list of login items would resolve the problem. So far, so good. My connection seems solid (its only been an hour, but earlier it would drop after 5 minutes of use).
I hope my problem that (literally!) used up hundreds of hours of my time has been finally resolved. I hope this solution will work for at least some of you as well. What gives me hope is that this solution is logically consistent with the history of my problems. I probably first downloaded Real Player in June 2008. And when I did a clean install, I remember downloading Real Player a few days after the reinstall. So I'm pretty hopeful that my issue has been finally resolved.
Shame on Real Player for putting out a defective piece of software. And thank you Joe!

Loop drops when connected wireless (NI 9191)

Hi,
I cannot figure out why a NI cDAQ 9191 chassis has connection drops when connected wireless and works
perfectly when connected thru LAN.
I wrote a little test VI to check the connection accuracy. The chassis has a NI 9375 I/O module plugged in.
A Moxa AWK3121 is used as wireles access point. What I do is check 5 digital inputs and control 3 digital outputs.
The outputs are continuously placed on/off at a different rate. I use an event loop and a main loopt that communicates
to the chassis at a loop rate of 10ms.
The chassis, laptop and Moxa A.P. are all close together on my desk. The Wifi signal is excellent.
Now, the code i written is probably not optimal.
But... If I start with connecting the chassis with a LAN cable to my laptop, Wifi Disabled, Linked Local. The communication is perfect.
No drops between the loops and the real time.
No communication errors. Runtime was 52 minutes.
Second test. Connected the chassis to the Moxa A.P. with LAN cable. Laptop connected wireless to the Moxa A.P.
Chassis still in Link Local. Ik can access the chassis in MAX. No problem.
When I run my test, I immediately see loop pauzes. After one minute there can be already a difference of 20 sec.
between calculated looptime and real time. Sometimes the active light on the chassis goes off and on.
When the active light is out, the loop is on hold. (Wich is normal as I assume the DAQ VI's are waiting for response.)
After appr.10 minutes the error -50405 "No Transfer in progress because transfer was aborted by client".
If I look at the timings there is already a difference of more then 5 minutes between the loop timing and the real time.
As last I tested with the chassis and the PC connected wireless to the Moxa A.P.
I did not get the -50405 error, but again loop drops. After 10 minutes there was a shift of 2 minutes.
Has anyone experience with wireless connections with the NI 9191 chassis?
Can I change my code? Did I mis something? (I'm a newbie to Labview)
Any help or suggestions would be appreciated.
Thanks in advance.
Frankie.
Labview 2014 SP1 (32bit) on Windows 7 Enterprise (X64)
Chassis and Moxa all updated to the latest firmware.
Solved!
Go to Solution.
Attachments:
Chassis919Tester.vi ‏51 KB
Symmetrical_Pulse_Generator.vi ‏55 KB

I am not clear on whether you are connecting the two together "in it's own little network" (which implies "router" and not "AP") or if you are connecting to the LAN through the wireless device (in which case it is entirely appropriate to refer to the wireelss device as an "AP"). Your last post about hot spots is what confused me.
But as you said, the biggest worry is the active light. Try using a different router/AP. I've seen routers overheat and reset themselves before due to inadequate heat sinking. i.e., Someone (not me, I swear!) dropped the AP and knocked the heat sink off the chip.
As for the delay, if you are indeed using the Moxa as an AP, are you sure you're connecting to your AP? If you're connected to a hotspot instead, your throughput will be at least halved - and maybe even 1/4 bandwidth if your AP happens to have connected to a different hotspot than you did. If you are using it as a router, try differnt bands or channels to see if you can get around any interference your company wireless network might be generating.
In general, conclude that wireless isn't the best way to connect test devices together.
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all.

After working fine for several months, my iPhone 5 has started dropping bluetooth connectivity for 2 to 5 seconds at a time with my Sony MDR-1RBT headphones. The headphones work fine with other devices. I haven't moved to ios7 yet. Any ideas?

After working fine for several months, my iPhone 5 has started dropping bluetooth connectivity for 2 to 5 seconds at a time with my Sony MDR-1RBT headphones. The headphones work fine with other bluetooth devices. I haven't moved to iOS7 yet. Any ideas?

What user troubleshooting have you done on the phone? The steps are restart, reset, restore from backup, restore as new. Understand that a restore will put the latest iOS on your device. It is also possible there is a hardware fault on the device and the Bluetooth is failing. Anything is possible given the scenario you describe.
And as far as iOS 7.x is concerned, we have 5 different iPhones here at home, all with the latest iOS, a 4, 4s, 5c, and 2-5s and all are working just fine. So, a blanket statement such as the one provided by the other poster is not completely true. Others are not having any issues at all either.

AP periodically dropping his connection to WLC

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