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I got a
03:00.0 Network controller: Intel Corporation PRO/Wireless 5100 AGN [Shiloh] Network Connection
that worked just fine yesterday and I didn't changed my setup except for a full system upgrade (pacman -Syu). Since then I can't connect to my wireless anymore ; NetworkManager constantly tries to connect but fails to do so.
dmesg excerpt:
[ 3076.540846] wlan0: authenticate with <wifi-ap-mac>
[ 3076.541855] wlan0: send auth to <wifi-ap-mac> (try 1/3)
[ 3076.544363] wlan0: authenticated
[ 3076.547822] wlan0: associate with <wifi-ap-mac> (try 1/3)
[ 3076.550793] wlan0: RX AssocResp from <wifi-ap-mac> (capab=0x431 status=12 aid=0)
[ 3076.550799] wlan0: <wifi-ap-mac> denied association (code=12)
[ 3076.569989] wlan0: deauthenticating from <wifi-ap-mac> by local choice (reason=3)
Now, I did find some suggestion on how one could fix this issue ; mostly pm related stuff like doing a "sudo iwconfig wlan0 power off/on", I tried restarting multiple times and also turning the wireless hardware switch on and off at different times, none of which worked.
Luckily I have a list of what I upgraded to which version... which is quite long:
0ad-a15-4 accountsservice-0.6.37-1 akonadi-1.12.0-1 antlr2-2.7.7-6 apache-2.4.9-1 apr-util-1.5.3-3 archlinux-keyring-20140220-1
avr-binutils-2.24-1 avr-gcc-4.8.2-2 bash-4.3-3 bluez-5.16-1 bluez-libs-5.16-1 bluez-utils-5.16-1 calligra-braindump-2.8.0-2
calligra-extras-2.8.0-2 calligra-filters-2.8.0-2 calligra-flow-2.8.0-2 calligra-handbook-2.8.0-2 calligra-karbon-2.8.0-2
calligra-kexi-2.8.0-2 calligra-krita-2.8.0-2 calligra-libs-2.8.0-2 calligra-plan-2.8.0-2 calligra-plugins-2.8.0-2
calligra-sheets-2.8.0-2 calligra-stage-2.8.0-2 calligra-words-2.8.0-2 chromium-33.0.1750.152-1 chrpath-0.16-1 clamav-0.98.1-2
clementine-1.2.2-1 clutter-1.16.4-3 cmake-2.8.12.2-2 coreutils-8.22-3 cppcheck-1.64-1 cryptsetup-1.6.4-1 cups-1.7.1-4
cups-filters-1.0.49-1 cython2-0.20.1-1 darktable-1.4.1-1 dbus-glib-0.102-1 dcraw-9.20-1 device-mapper-2.02.105-2 dhclient-4.3.0-1
dhcpcd-6.3.2-1 dialog-1:1.2_20140219-1 dosfstools-3.0.26-1 e2fsprogs-1.42.9-2 easytag-2.1.10-1 eigen-3.2.1-1 elfutils-0.158-1
espeak-1.48.04-1 ethtool-1:3.13-1 ffmpeg-1:2.1.4-1 ffmpeg-compat-1:0.10.12-1 file-5.17-2 filezilla-3.7.4.1-1 firefox-28.0-1
flashplugin-11.2.202.346-1 flex-2.5.38-1 foomatic-db-3:20140324-1 foomatic-db-engine-3:20140324-1 foomatic-db-nonfree-3:20140324-1
freetype2-2.5.3-2 gajim-0.15.4-2 gcr-3.10.1-3 gdal-1.10.1-2 gdk-pixbuf2-2.30.6-1 git-1.9.1-1 gitg-0.3.2-1 glibc-2.19-3
gnuradio-3.7.2.1-2 gnutls-3.2.12.1-1 gparted-0.18.0-1 grep-2.18-1 grub-1:2.02.beta2-2 gst-plugins-bad-1.2.3-2 gst-plugins-base-1.2.3-1
gst-plugins-base-libs-1.2.3-1 gst-plugins-good-1.2.3-2 gstreamer-1.2.3-1 gstreamer0.10-bad-0.10.23-8 gstreamer0.10-bad-plugins-0.10.23-8
gstreamer0.10-good-0.10.31-5 gstreamer0.10-good-plugins-0.10.31-5 gtkspell3-3.0.4-1 guake-0.4.4-3 guvcview-1.7.3-1 harfbuzz-0.9.26-1
harfbuzz-icu-0.9.26-1 help2man-1.44.1-1 hicolor-icon-theme-0.13-1 ibus-1.5.6-1 imagemagick-6.8.8.9-1 intel-dri-10.1.0-4
intel-gpu-tools-1.6-1 intellij-idea-community-edition-13.1.1-1 intellij-idea-libs-13.1.1-1 iw-3.14-1 kactivities-4.12.3-1
kde-base-artwork-4.12.3-1 kde-l10n-de-4.12.3-1 kdeaccessibility-jovie-4.12.3-1 kdeaccessibility-kaccessible-4.12.3-1
kdeaccessibility-kmag-4.12.3-1 kdeaccessibility-kmousetool-4.12.3-1 kdeaccessibility-kmouth-4.12.3-1 kdeadmin-kcron-4.12.3-1
kdeadmin-ksystemlog-4.12.3-1 kdeadmin-kuser-4.12.3-1 kdeartwork-colorschemes-4.12.3-1 kdeartwork-kscreensaver-4.12.3-1
kdeartwork-styles-4.12.3-1 kdeartwork-weatherwallpapers-4.12.3-1 kdebase-dolphin-4.12.3-1 kdebase-katepart-4.12.3-1
kdebase-kdepasswd-4.12.3-1 kdebase-kdialog-4.12.3-1 kdebase-keditbookmarks-4.12.3-1 kdebase-kfind-4.12.3-1 kdebase-konq-plugins-4.12.3-1
kdebase-konqueror-4.12.3-1 kdebase-konsole-4.12.3-1 kdebase-kwrite-4.12.3-1 kdebase-lib-4.12.3-1 kdebase-plasma-4.12.3-1
kdebase-runtime-4.12.3-1 kdebase-workspace-4.11.7-2 kdebindings-python-4.12.3-1 kdebindings-python-common-4.12.3-1
kdebindings-python2-4.12.3-1 kdeedu-analitza-4.12.3-1 kdeedu-blinken-4.12.3-1 kdeedu-cantor-4.12.3-1 kdeedu-kalgebra-4.12.3-1
kdeedu-kalzium-4.12.3-1 kdeedu-kanagram-4.12.3-1 kdeedu-kbruch-4.12.3-1 kdeedu-kgeography-4.12.3-1 kdeedu-khangman-4.12.3-1
kdeedu-kig-4.12.3-1 kdeedu-kiten-4.12.3-1 kdeedu-klettres-4.12.3-1 kdeedu-kmplot-4.12.3-1 kdeedu-kstars-4.12.3-1 kdeedu-ktouch-4.12.3-2
kdeedu-kturtle-4.12.3-1 kdeedu-kwordquiz-4.12.3-1 kdeedu-marble-4.12.3-1 kdeedu-pairs-4.12.3-1 kdeedu-parley-4.12.3-1
kdeedu-rocs-4.12.3-1 kdeedu-step-4.12.3-1 kdegraphics-gwenview-4.12.3-1 kdegraphics-kamera-4.12.3-1 kdegraphics-kcolorchooser-4.12.3-1
kdegraphics-kgamma-4.12.3-1 kdegraphics-kolourpaint-4.12.3-1 kdegraphics-kruler-4.12.3-1 kdegraphics-ksnapshot-4.12.3-1
kdegraphics-mobipocket-4.12.3-1 kdegraphics-okular-4.12.3-1 kdelibs-4.12.3-1 kdemultimedia-audiocd-kio-4.12.3-1
kdemultimedia-dragonplayer-4.12.3-1 kdemultimedia-ffmpegthumbs-4.12.3-1 kdemultimedia-juk-4.12.3-1 kdemultimedia-kmix-4.12.3-1
kdemultimedia-kscd-4.12.3-1 kdemultimedia-mplayerthumbs-4.12.3-1 kdenetwork-filesharing-4.12.3-1 kdenetwork-kdnssd-4.12.3-1
kdenetwork-kget-4.12.3-1 kdenetwork-kopete-4.12.3-1 kdenetwork-kppp-4.12.3-1 kdenetwork-krdc-4.12.3-1 kdenetwork-krfb-4.12.3-1
kdenlive-0.9.6-4 kdepim-akonadiconsole-4.12.3-1 kdepim-akregator-4.12.3-1 kdepim-blogilo-4.12.3-1 kdepim-console-4.12.3-1
kdepim-kaddressbook-4.12.3-1 kdepim-kalarm-4.12.3-1 kdepim-kjots-4.12.3-1 kdepim-kleopatra-4.12.3-1 kdepim-kmail-4.12.3-1
kdepim-knode-4.12.3-1 kdepim-knotes-4.12.3-1 kdepim-kontact-4.12.3-1 kdepim-korganizer-4.12.3-1 kdepim-kresources-4.12.3-1
kdepim-ktimetracker-4.12.3-1 kdepim-ktnef-4.12.3-1 kdepim-libkdepim-4.12.3-1 kdepim-runtime-4.12.3-1 kdepimlibs-4.12.3-1
kdesdk-cervisia-4.12.3-1 kdesdk-dev-scripts-4.12.3-1 kdesdk-dev-utils-4.12.3-1 kdesdk-dolphin-plugins-4.12.3-1
kdesdk-kapptemplate-4.12.3-1 kdesdk-kate-4.12.3-1 kdesdk-kcachegrind-4.12.3-1 kdesdk-kioslaves-4.12.3-1 kdesdk-kompare-4.12.3-1
kdesdk-lokalize-4.12.3-1 kdesdk-okteta-4.12.3-1 kdesdk-poxml-4.12.3-1 kdesdk-strigi-analyzers-4.12.3-1 kdesdk-umbrello-4.12.3-1
kdetoys-amor-4.12.3-1 kdetoys-kteatime-4.12.3-1 kdetoys-ktux-4.12.3-1 kdeutils-ark-4.12.3-1 kdeutils-filelight-4.12.3-1
kdeutils-kcalc-4.12.3-1 kdeutils-kcharselect-4.12.3-1 kdeutils-kdf-4.12.3-1 kdeutils-kfloppy-4.12.3-1 kdeutils-kgpg-4.12.3-1
kdeutils-kremotecontrol-4.12.3-1 kdeutils-ktimer-4.12.3-1 kdeutils-kwallet-4.12.2-1 [removal] kdeutils-kwalletmanager-4.12.3-1
kdeutils-print-manager-4.12.3-1 kdeutils-superkaramba-4.12.3-1 kdeutils-sweeper-4.12.3-1 kdewebdev-kfilereplace-4.12.3-1
kdewebdev-kimagemapeditor-4.12.3-1 kdewebdev-klinkstatus-4.12.3-1 kdewebdev-kommander-4.12.3-1 keyutils-1.5.9-1 lib32-elfutils-0.158-1
lib32-freetype2-2.5.3-1 lib32-gdk-pixbuf2-2.30.6-1 lib32-glibc-2.19-3 lib32-harfbuzz-0.9.26-1 lib32-intel-dri-10.1.0-4
lib32-libgcrypt-1.6.1-1 lib32-libldap-2.4.39-1 lib32-libpng-1.6.10-1 lib32-libpulse-5.0-1 lib32-libvdpau-0.7-2 lib32-libxshmfence-1.1-1
lib32-mesa-10.1.0-4 lib32-mesa-libgl-10.1.0-4 lib32-nspr-4.10.3-1 lib32-pango-1.36.2-1 lib32-readline-6.3.000-1 lib32-sqlite-3.8.4.1-1
lib32-systemd-211-1 lib32-util-linux-2.24.1-1 lib32-wayland-1.4.0-1 libarchive-3.1.2-6 libass-0.11.1-1 libburn-1.3.6.pl01-1
libcacard-1.7.0-2 libcups-1.7.1-4 libedit-20140213_3.1-1 libetonyek-0.0.3-1 libevdev-1.0.1-1 libfreexl-1.0.0g-2 libftdi-1.1-3
libgadu-1.11.3-1 libgit2-glib-0.0.12-1 libgphoto2-2.5.3.1-2 libibus-1.5.6-1 libindi-0.9.7-1 libisoburn-1.3.6.pl01-1 libisofs-1.3.6-1
libkcddb-4.12.3-1 libkcompactdisc-4.12.3-1 libkdcraw-4.12.3-1 libkdeedu-4.12.3-1 libkdegames-4.12.3-1 libkexiv2-4.12.3-1
libkeybinder2-0.3.0-2 libkgapi-2.1.0-1 libkipi-4.12.3-1 libkmahjongg-4.12.3-1 libkolab-0.5.0-1 libkolabxml-1.0.1-1
libkomparediff2-4.12.3-1 libksane-4.12.3-1 libmbim-1.8.0-1 libmikmod-3.3.6-1 libmm-glib-1.2.0-3 libmodplug-0.8.8.5-1 libmsn-4.2.1-2
libnl-3.2.24-1 libodfgen-0.0.4-1 libpng-1.6.10-1 libpng12-1.2.51-1 libpulse-5.0-1 libreoffice-base-4.2.2-2 libreoffice-calc-4.2.2-2
libreoffice-common-4.2.2-2 libreoffice-de-4.2.2-1 libreoffice-draw-4.2.2-2 libreoffice-impress-4.2.2-2 libreoffice-kde4-4.2.2-2
libreoffice-math-4.2.2-2 libreoffice-postgresql-connector-4.2.2-2 libreoffice-writer-4.2.2-2 libspatialite-4.1.1-4 libspnav-0.2.2-5
libssh-0.5.5-3 libsystemd-211-1 libtirpc-0.2.4-1 libuhd-3.6.2-1 libusb-1.0.18-1 libusbx-1.0.17-1 [removal] libutil-linux-2.24.1-3
libva-1.3.0-1 libvisio-0.0.31-2 libwacom-0.9-1 libwbclient-4.1.6-1 libzrtpcpp-4.2.0-1 link-grammar-4.8.6-1 linux-3.13.7-1
linux-firmware-20140316.dec41bc-1 lirc-utils-1:0.9.0-70 lvm2-2.02.105-2 lynx-2.8.8-1 lyx-2.0.7.1-1 man-pages-3.63-1 mariadb-5.5.36-1
maven-3.2.1-1 maxima-5.32.1-3 mediastreamer-2.10.0-2 mercurial-2.9.1-1 mesa-10.1.0-4 mesa-libgl-10.1.0-4 miniupnpc-1.9-1
mjpegtools-2.1.0-1 mkinitcpio-17-1 modemmanager-1.2.0-3 mono-3.2.8-1 mpd-0.18.9-1 mpg123-1.19.0-1 mpv-0.3.6-1 ncftp-3.2.5-4
nepomuk-core-4.12.3-1 nepomuk-widgets-4.12.3-1 net-snmp-5.7.2.1-2 netcdf-4.3.1.1-1 networkmanager-0.9.8.8-3 nginx-1.4.7-1
nodejs-0.10.26-1 nspr-4.10.4-1 nss-3.15.5-1 ntfs-3g-2014.2.15-1 ntp-4.2.6.p5-19 openconnect-1:5.03-1 openjpeg-1.5.1-2
openscad-2014.03-1 openssh-6.6p1-1 orbit2-2.14.19-3 ortp-0.23.0-1 oxygen-gtk2-1.4.4-2 oxygen-gtk3-1.3.4-1 oxygen-icons-4.12.3-1
p11-kit-0.20.2-1 pango-1.36.3-1 parted-3.1-4 pcsclite-1.8.11-1 perl-error-0.17022-1 perl-image-exiftool-9.53-1 postgresql-9.3.4-1
postgresql-libs-9.3.4-1 ppp-2.4.6-2 prison-1.1.0-1 pulseaudio-5.0-1 pycups-1.9.66-1 pysmbc-1.0.13-2 python-3.3.5-1
python-docs-3.3.4-1 python-numpy-1.8.0-2 python-pytz-2014.1-1 python-six-1.6.1-1 python2-2.7.6-3 python2-babel-1.3-3
python2-cffi-0.8.2-3 python2-cryptography-0.2.2-1 python2-docs-2.7.6-1 python2-ecdsa-0.11-1 python2-keybinder2-0.3.0-2
python2-lxml-3.3.3-1 python2-markdown-2.4-2 python2-markupsafe-0.19-1 python2-numpy-1.8.0-2 python2-paramiko-1.13.0-1
python2-pillow-2.3.1-1 python2-ply-3.4-3 python2-pycparser-2.10-3 python2-pyopenssl-0.14-2 python2-pytz-2014.1-1
python2-setuptools-3.3-1 python2-simplejson-3.3.3-1 python2-six-1.6.1-1 python2-urwid-1.2.0-1 python2-zope-interface-4.1.0-1
qemu-1.7.0-2 raptor-2.0.13-1 rasqal-1:0.9.32-1 readline-6.3-3 rsnapshot-1.3.1-5 s-nail-14.6.2-1 sbc-1.2-1 sbcl-1.1.16-1 serf-1.3.4-1
skype-4.2.0.13-3 smbclient-4.1.6-1 smpeg-0.4.5-1 socat-1.7.2.4-1 soundtouch-1.8.0-1 sqlite-3.8.4.1-1 steam-1.0.0.47-1
subversion-1.8.8-1 sudo-1.8.10.p2-1 supertuxkart-0.8.1-4 swig-3.0.0-1 systemd-211-1 systemd-sysvcompat-211-1 t1lib-5.1.2-5
talloc-2.1.0-1 teamspeak3-3.0.14-2 telepathy-glib-0.22.1-1 telepathy-mission-control-5.16.1-1 tevent-0.9.21-2
texlive-bibtexextra-2013.33039-1 texlive-bin-2013.30973-8 texlive-core-2013.33063-1 texlive-fontsextra-2013.33010-1
texlive-formatsextra-2013.31958-1 texlive-games-2013.32919-1 texlive-genericextra-2013.32809-1 texlive-htmlxml-2013.33024-1
texlive-humanities-2013.33061-1 texlive-latexextra-2013.33063-1 texlive-music-2013.32525-1 texlive-pictures-2013.33045-1
texlive-plainextra-2013.32911-1 texlive-pstricks-2013.33056-1 texlive-publishers-2013.33042-1 texlive-science-2013.32850-1
texmaker-4.1.1-1 the_silver_searcher-0.21.0-1 thunderbird-24.4.0-1 totem-plparser-3.10.1-1 tp_smapi-0.41-44 tzdata-2014a-1
udisks-1.0.5-1 udisks2-2.1.3-1 usbredir-0.6-4 util-linux-2.24.1-3 virtualbox-4.3.8-2 virtualbox-host-modules-4.3.8-1
virtuoso-base-1:6.1.8-1 vlc-2.1.4-1 webkitgtk-2.2.5-2 webkitgtk2-2.2.5-2 wine-1.7.15-1 winetricks-20140302-1 wireshark-cli-1.10.6-1
wireshark-gtk-1.10.6-1 wpa_supplicant-2.1-3 xapian-core-1:1.2.17-1 xcb-util-wm-0.4.1-1 xf86-video-intel-2.99.911-1 xfburn-0.5.0-1
xmlto-0.0.25-5 xterm-303-1 zeromq-4.0.4-2
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I'm pretty sure reason 3 indicates a password issue. Verify the Network Manager's security settings for the network you are trying to connect to.
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I did that and verified the PSK. It's correct, I'm sure. The log above also says "send auth to ... authenticated" ; I don't know the details of wireless terminology, but I'd guess this means that the auth (via PSK) is correct.
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run systemctl without paramaters, check the output to see if there are any dhcp services started.
If so, stop & disable them, reboot and check if networkmanager works.
Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.
(A works at time B) && (time C > time B ) ≠ (A works at time C)
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No network manager or DHCP service besides NetworkManager is enabled and/or running
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Have you tried disabling network manager and connecting manually?
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I "solved" this (for now) by downgrading kernel, systemd, networkmanager and some other packages to earlier versions.
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