AP55 are going offline (connected to SG 135W 9.509-3)

Question

Hi,

since 4 weeks we have 2 AP55 (configured as mesh APs) that are going offline time to time.

What I ask myself is how to figure out what happend:

Can I figure out if the AP reboots because of power lost or is something different the cause?

How can I get the SW Version of the AP?

SG means: last seen 7/23 20:33h but wlan log means:

7/24 0:6h STA <MAC> authenticated and STA <MAC> associated

and AWELOGGER menas: "connected" 7/24 a couple of seconds later

So the AP is "a Little bit" visible?

How can I proceed?

Thanks für help

Gernot

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sachingurung · Answer

Hi, 
 
 Take SSH to the UTM and restart awed services by executing the following command: /var/mdw/scripts/awed restart 
 When the AP goes offline, what does the LeD status reflect, refer to the following document to understand the LeD light status for all the AP models. https://www.sophos.com/en-us/medialibrary/PDFs/documentation/sophoswirelessoien.pdf?la=en.pdf 
 Change physical connection (cables) which connects AP to UTM and the power adapter. 
 Make sure you use the provided power adapter or PoE adapter that comes along with the AP. If you are using a different adapter it could cause a socket error. 
 Try a different fr&eacute;nquence band and change the channel selection to Manual and try to find a channel width with less congestion. 
 Finally, delete the AP and re add it with a fresh AP configuration. 
 
 After executing the changes, capture the awed.log and show us the results. 
 Thanks,

sachingurung · Answer

Hi, 
 Did you make any changes to the frequency band to test if that helps? Alongside, AP firmware is available in the /etc/wireless/firmware directory. CAT the .devinfo file and you will get the details. 
 Thanks,

sachingurung · Answer

Can you PM me the complete log file? I want to check what channel did the APs select and alongside, reading your previous reply, that a physically connected AP is always online, I suspect that the issue is related to channel congestion. 
 You can choose a specific channel for an AP instead of using "Auto" option. This Channel selection is done at start-up and hourly using background scans. 
 As multiple APs are being used, they should be configured to use different channels if their signals will overlap; and these channels should be as far apart as possible. For example, you are using a 2.5 GHz band so you have channel 1, 6 and 11 which will never overlap. So you can configure the APs in the following manner, 
 AP1: channel 1 
 AP2: channel 6 
 AP3: channel 11 
 Alongside, it is also important to ensure that access points are not scanning for the best channel, at the same time , as it is likely that they will all end up using the same channel. This could happen if the UTM boots all of the access points at the same time, or if you have configured the access points to all scan at the same time using a time definition. 
 Configure different time based definitions and assign them to the SSiDs in the Advanced option for a Wireless Network definition. 
 Please monitor and let me know the results after the configurations changes. 
 Thanks,