I have 35 AP650's deployed across 3 buildings. I have some weird issues with Android phones ex. Pixel 3, Galaxy s8+, OnePlus 6t, and others getting the message connected, no internet.

[donnie_johnson]

I have 35 AP650's deployed across 3 buildings. I have some weird issues with Android phones ex. Pixel 3, Galaxy s8+, OnePlus 6t, and others getting the message connected, no internet.

[weekdaysailor]

This may be invalid, but one post I've seen claims Android devices are polling http://connectivitycheck.gstatic.com/generate_204

If it gets anything other than a 204, it will declare internet down (either blocked or in captive portal)

Could you have a proxy/ACL or something else blocking this URL?

[side note..kind of interesting this URL isn't TLS/HTTPS - seems ripe for abuse..]

user@penguin:~$ wget http://connectivitycheck.gstatic.com/generate_204

--2019-05-23 09:40:04-- http://connectivitycheck.gstatic.com/generate_204

Resolving connectivitycheck.gstatic.com (connectivitycheck.gstatic.com)... 172.217.6.67, 2607:f8b0:4005:808::2003

Connecting to connectivitycheck.gstatic.com (connectivitycheck.gstatic.com)|172.217.6.67|:80... connected.

HTTP request sent, awaiting response... 204 No Content

2019-05-23 09:40:04 (0.00 B/s) - ‘generate_204’ saved [0]

[bruce_stahlin]

I would recommend picking one of the clients and run Client Monitor to observe authentication, DHCP negotiations, etc. Are they running the same Android OS rev?