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Solved
WAC510 5GHz connectivity issues
Recently I noticed a very odd issue when using two WAC510 accesspoints at one location. 2 LG smartphones seem to have issues when connected to the 5GHz band. The wireless link is fine and strong ...
Sorry, for the past days there were several break and entry (with theft) problems in our house and neighbourhood. This is at the moment our first concern. We didn't have time to investigate a lot during those days.
Apparently the issue has several causes. The android devices are running Android 7.x. WAC510's are running the latest firmware. Apparently I had a lot of connects/disconnects at a certain moment, but on one side, Android didn't seem to connect anymore to the internet. Wifi connection was ok, but Android decided that the TCP/IP layer wasn't ok. Apparently is does some scans then, which my business router/firewall didn't like that and its IPS kicked in and blocked the Android devices. Since Android couldn't make a connection at all to the Internet anymore when it got blocked, it disables the wireless connection, and tries again in a few minutes, thus is looks like the wireless connection is failing, while in reality Android lacks in disaplying real notifications : the Wifi didn't fail, the TCP/IP layer failed, since the firewall blocked access. Very frustrating.
Since I found out about that and reflashed the WAC510's to it's latest firmware and fine tuned the Intrusion Prevention Service settings in the firewall, I didn't have any issues anymore.
So in case someone experiences the same issues : please check your router/firewall logs as well if it's advanced enough to have IPS. Your android device might try to scan your internet connection (TCP/IP layer) and scan your local network through Wifi and might get blocked this way, but it really looks like intermittent Wifi issues.
Sorry to have wasted your time, but learn from this one oversight of mine (not checking IPS logs).
dynamiX your issue could be different here. Could you please let us know how your AP is connected to network and share the detailed logs for us to debug further?
Thanks
Raghu
since i posted i have not had any issues anymore
Sorry, for the past days there were several break and entry (with theft) problems in our house and neighbourhood. This is at the moment our first concern. We didn't have time to investigate a lot during those days.
Apparently the issue has several causes. The android devices are running Android 7.x. WAC510's are running the latest firmware. Apparently I had a lot of connects/disconnects at a certain moment, but on one side, Android didn't seem to connect anymore to the internet. Wifi connection was ok, but Android decided that the TCP/IP layer wasn't ok. Apparently is does some scans then, which my business router/firewall didn't like that and its IPS kicked in and blocked the Android devices. Since Android couldn't make a connection at all to the Internet anymore when it got blocked, it disables the wireless connection, and tries again in a few minutes, thus is looks like the wireless connection is failing, while in reality Android lacks in disaplying real notifications : the Wifi didn't fail, the TCP/IP layer failed, since the firewall blocked access. Very frustrating.
Since I found out about that and reflashed the WAC510's to it's latest firmware and fine tuned the Intrusion Prevention Service settings in the firewall, I didn't have any issues anymore.
So in case someone experiences the same issues : please check your router/firewall logs as well if it's advanced enough to have IPS. Your android device might try to scan your internet connection (TCP/IP layer) and scan your local network through Wifi and might get blocked this way, but it really looks like intermittent Wifi issues.
Sorry to have wasted your time, but learn from this one oversight of mine (not checking IPS logs).
P.S.: the reason that I think I had these issues primarely over the 5GHz band, is because of the faster connection speeds. Probably Android was able to flood the netwerk/router with it's scans which wasn't possible when using the 2.4GHz band.
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