Intel Centrino Wireless-N 2230 won't connect, keeps asking for password

Question

I'm on Kubuntu 16.04, all packages up to date.

Yesterday, out of the blue (not after a reboot or anything), my WiFi stopped working. The hardware is still working, I am able to connect over Ethernet, and all the local WiFi networks are listed in the NetworkManager widget. But when I try to connect to my WiFi network, it says "Configuring interface...", asks for a password, stalls for a moment, asks again, and so on, over and over again, never connecting.

I have already rebooted many times, installed all updates, and tried deleting and adding the connection, marking the connection as "Available to all users", and disabling kwallet.

EDIT: Here's the output of lspci -knn | grep Net -A3:

02:00.0 Network controller [0280]: Intel Corporation Centrino Wireless-N 2230 [8086:0887] (rev c4)
    Subsystem: Intel Corporation Centrino Wireless-N 2230 BGN [8086:4062]
    Kernel driver in use: iwlwifi
    Kernel modules: iwlwifi

The fix from this question, suggested by user68186, works for me (I'm able to connect to WiFi, thank you!).

So here's my updated question: is there a way for me to make WiFi work without disabling 802.11n speeds?

@user68186: Thanks, I'd missed that one in my searches. I'll test, if it works, we can close as duplicate. — Linuxios, Feb 09 '17 at 18:18
Please [edit] your question and add output of lspci -knn | grep Net -A3 terminal command. — Pilot6, Feb 09 '17 at 18:18
Make sure that you're using WPA2-AES in router. Reboot your wireless router. Delete/re-add the wireless profile again if need be. — heynnema, Feb 09 '17 at 18:22
@heynnema: The router is using WPA2-AES, every other device in the house still works. — Linuxios, Feb 09 '17 at 18:23
Only takes a couple of minutes to reboot the router. I'd still try it. — heynnema, Feb 09 '17 at 18:24
@heynnema: I can't disconnect everyone else right now, but I will when I have a chance. — Linuxios, Feb 09 '17 at 18:28
@Pilot6: I added the info and updated my question; thank you for your solution from the other question. — Linuxios, Feb 09 '17 at 18:29
You can try that command using 11n_disable=8, then if it does not fix 11n_disable=4. That will not fully disable the 802.11n. This adapter poorly supports it. — Pilot6, Feb 09 '17 at 18:31
@Pilot6: 11n_disable=8 is working so far, thank you. If you add an answer I'll accept. — Linuxios, Feb 09 '17 at 18:33
Did you reboot after you entered the command? It requires a reboot to apply. — Pilot6, Feb 09 '17 at 18:34
@Pilot6: Yes. Currently running with 11n_disable=8 in /etc/modprobe.d/iwlwifi-opt.conf after reboot. — Linuxios, Feb 09 '17 at 18:36
But... what kind of connection speed are you getting after adding the 11n_disable parameter? — heynnema, Feb 09 '17 at 18:38
I am writing an answer. The speed should be normal for 802.11n. — Pilot6, Feb 09 '17 at 18:38
@heynnema: According to Google's speed test, I'm getting 47.5 Mbps download right now, which sounds about right to me. — Linuxios, Feb 09 '17 at 18:41

Pilot6 · Accepted Answer · 2017-02-09T18:56:28.207

2

You need to set a kernel module option. Run in a terminal

sudo tee /etc/modprobe.d/iwlwifi-opt.conf <<< "options iwlwifi 11n_disable=8"

and reboot.

That sets the enable agg TX option for the iwlwifi module. This is required for this adapter to work in 802.11n mode well.

edited Feb 09 '17 at 18:56

answered Feb 09 '17 at 18:41

Pilot6

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If these are similar problems, can we consolidate these to one question possibly with multiple answers for different WiFi chips? Thanks – user68186 Feb 09 '17 at 19:35
What kind of different chips you mean? This solution is specific to some Intel adapters. – Pilot6 Feb 09 '17 at 19:37
Sorry, I didn't read the other question carefully enough and assumed they were different chips. Why 11n_disable=8 in one and 11n_disable=1 in the other? – user68186 Feb 09 '17 at 19:40
11n_disable=1 disables the n mode. It is guaranteed to fix the issue. 8 does not disable anything but enables agg TX whatever this means. It may also fix it. – Pilot6 Feb 09 '17 at 20:16

Intel Centrino Wireless-N 2230 won't connect, keeps asking for password

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