Random slow wifi logon issues

[Shibboleth]

Any pointers about an issue I'm seeing - Windows 10 laptops and student accounts are pretty much randomly having very long (20 mins _+) login times and GPO loading. Same user / same laptop might or might not be fine next time round. Nothing I have yet come across in logs gives me any real pointers. Once the login has completed then performance is fine. Any advice about what / how to log this as I might have missed a trick. I've tried updating firmware on the client laptops but it seems to be happening to a couple of different types of machine now. I 'feel' its something about the AD / wireless rather than client side but I could be wrong. TIA

[FN-GM]

It doesn't like DNS to me. Are the clients picking up the correct DNS server and is that server responding correct?

[Guest Guest]

Are students logging in at the same time?

[RLR]

Is there a GPO that is trying to be applied but failing. I believe a GPOs timeout period is 15 mins so if after 15 mins it hasn't applied, it will carry on logging in. Might be worth checking the GPOs that are applied to the machines and removing them one by one to see if it gets better. Check Event logs to see if there's anything in there.

[FN-GM]

It doesn't like DNS to me. Are the clients picking up the correct DNS server and is that server responding correct?

 

That should say

 

It sounds like DNS to me***

[mullet_man]

Is this a recent issue? Had logins been OK previously?

 

If you think it might be wireless related, have you tried disabling the wireless and wiring the laptops in and seeing if you get faster logins?

[Shibboleth]

Thanks for the responses - some further things to investigate when I get a chance.

Does look like it might be the aerohive access points 'deauthenticating' clients = that has shown up in the logs- and one teacher has told me that they have seen issues with laptops dropping off the network some time after successful login - so maybe it is congestion/thoughput rather than login/gpo processing per-se. I have put a wired switch inthe room that seems to witigate the logon issue - so it looks more and more like its wireless specific.