升级到15.10 Wifi到企业网络（WPA2）后不再工作
上周五我更新到Ubuntu 15.10。 那时我和Wifi连接到公司网络。 升级后它不再起作用了。
wifi连接的配置：
安全性：WPA和WPA2企业版
身份validation：受保护的EAP（PEAP）
复选框无需CA证书。
PEAP版本。 我尝试了所有3个选项：自动，版本0和版本1。
内部认证：MSCHAPv2
用户名和密码已存储。 我仍然可以通过相同凭据的手机连接到wifi。
这是我在syslog中看到的：
Oct 26 07:27:01 mymachine wpa_supplicant[974]: wlan0: SME: Trying to authenticate with b4:14:89:d1:2f:21 (SSID='CorporateNetwork' freq=2437 MHz) Oct 26 07:27:01 mymachine kernel: [ 3144.862773] wlan0: authenticate with b4:14:89:d1:2f:21 Oct 26 07:27:01 mymachine kernel: [ 3144.878081] wlan0: direct probe to b4:14:89:d1:2f:21 (try 1/3) Oct 26 07:27:01 mymachine NetworkManager[828]: (wlan0): supplicant interface state: disconnected -> authenticating Oct 26 07:27:01 mymachine kernel: [ 3145.081778] wlan0: direct probe to b4:14:89:d1:2f:21 (try 2/3) Oct 26 07:27:01 mymachine kernel: [ 3145.285917] wlan0: send auth to b4:14:89:d1:2f:21 (try 3/3) Oct 26 07:27:01 mymachine wpa_supplicant[974]: wlan0: Trying to associate with b4:14:89:d1:2f:21 (SSID='CorporateNetwork' freq=2437 MHz) Oct 26 07:27:01 mymachine kernel: [ 3145.304765] wlan0: authenticated Oct 26 07:27:01 mymachine kernel: [ 3145.305931] wlan0: associate with b4:14:89:d1:2f:21 (try 1/3) Oct 26 07:27:01 mymachine NetworkManager[828]: (wlan0): supplicant interface state: authenticating -> associating Oct 26 07:27:01 mymachine wpa_supplicant[974]: wlan0: Associated with b4:14:89:d1:2f:21 Oct 26 07:27:01 mymachine kernel: [ 3145.340295] wlan0: RX AssocResp from b4:14:89:d1:2f:21 (capab=0x431 status=0 aid=2) Oct 26 07:27:01 mymachine kernel: [ 3145.340396] wlan0: associated Oct 26 07:27:01 mymachine wpa_supplicant[974]: wlan0: CTRL-EVENT-REGDOM-CHANGE init=COUNTRY_IE type=COUNTRY alpha2=NL Oct 26 07:27:01 mymachine kernel: [ 3145.345160] cfg80211: Regulatory domain changed to country: NL Oct 26 07:27:01 mymachine kernel: [ 3145.345166] cfg80211: DFS Master region: ETSI Oct 26 07:27:01 mymachine kernel: [ 3145.345168] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time) Oct 26 07:27:01 mymachine kernel: [ 3145.345173] cfg80211: (2402000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A) Oct 26 07:27:01 mymachine kernel: [ 3145.345176] cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz, 160000 KHz AUTO), (N/A, 2000 mBm), (N/A) Oct 26 07:27:01 mymachine kernel: [ 3145.345180] cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz, 160000 KHz AUTO), (N/A, 2000 mBm), (0 s) Oct 26 07:27:01 mymachine kernel: [ 3145.345183] cfg80211: (5490000 KHz - 5710000 KHz @ 160000 KHz), (N/A, 2700 mBm), (0 s) Oct 26 07:27:01 mymachine kernel: [ 3145.345185] cfg80211: (57000000 KHz - 66000000 KHz @ 2160000 KHz), (N/A, 4000 mBm), (N/A) Oct 26 07:27:01 mymachine NetworkManager[828]: (wlan0): supplicant interface state: associating -> associated Oct 26 07:27:01 mymachine wpa_supplicant[974]: wlan0: CTRL-EVENT-EAP-STARTED EAP authentication started Oct 26 07:27:01 mymachine kernel: [ 3145.396028] wlan0: Limiting TX power to 2 dBm as advertised by b4:14:89:d1:2f:21 Oct 26 07:27:01 mymachine wpa_supplicant[974]: wlan0: CTRL-EVENT-EAP-PROPOSED-METHOD vendor=0 method=25 Oct 26 07:27:01 mymachine wpa_supplicant[974]: wlan0: CTRL-EVENT-EAP-METHOD EAP vendor 0 method 25 (PEAP) selected Oct 26 07:27:01 mymachine wpa_supplicant[974]: wlan0: CTRL-EVENT-EAP-PEER-CERT depth=1 subject='/C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=Terms of use at https://www.verisign.com/rpa (c)10/CN=VeriSign Class 3 Secure Server CA - G3' hash=64903546a58058d1e6f1bead1134ede66a6831d231f0df8d4e28535d7a300496 Oct 26 07:27:01 mymachine wpa_supplicant[974]: wlan0: CTRL-EVENT-EAP-PEER-CERT depth=0 subject='...stripped...' hash=abf1a463f10887c64e4858fb5a06c7016426508815ce324b4f7cea269b1fc029 Oct 26 07:27:01 mymachine wpa_supplicant[974]: wlan0: CTRL-EVENT-EAP-PEER-ALT depth=0 DNS:...stripped... Oct 26 07:27:01 mymachine kernel: [ 3145.498685] wlan0: Limiting TX power to 2 dBm as advertised by b4:14:89:d1:2f:21 Oct 26 07:27:01 mymachine wpa_supplicant[974]: SSL: SSL3 alert: read (remote end reported an error):unknown:unknown Oct 26 07:27:01 mymachine wpa_supplicant[974]: SSL: SSL3 alert: write (local SSL3 detected an error):fatal:illegal parameter Oct 26 07:27:01 mymachine wpa_supplicant[974]: OpenSSL: openssl_handshake - SSL_connect error:140940F6:SSL routines:ssl3_read_bytes:unknown alert type Oct 26 07:27:09 mymachine kernel: [ 3153.136903] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe B (start=185389 end=185390) Oct 26 07:27:25 mymachine NetworkManager[828]: (wlan0): Activation: (wifi) association took too long Oct 26 07:27:25 mymachine NetworkManager[828]: (wlan0): device state change: config -> need-auth (reason 'none') [50 60 0] Oct 26 07:27:25 mymachine NetworkManager[828]: (wlan0): Activation: (wifi) asking for new secrets Oct 26 07:27:25 mymachine kernel: [ 3169.209119] wlan0: deauthenticating from b4:14:89:d1:2f:21 by local choice (Reason: 3=DEAUTH_LEAVING) Oct 26 07:27:25 mymachine wpa_supplicant[974]: wlan0: CTRL-EVENT-DISCONNECTED bssid=b4:14:89:d1:2f:21 reason=3 locally_generated=1 Oct 26 07:27:25 mymachine NetworkManager[828]: Connection disconnected (reason -3) Oct 26 07:27:25 mymachine NetworkManager[828]: (wlan0): supplicant interface state: associated -> disconnected Oct 26 07:27:25 mymachine NetworkManager[828]: Failed to GDBus.Error:fi.w1.wpa_supplicant1.NotConnected: This interface is not connected: disconnect. Oct 26 07:27:25 mymachine gnome-session[1578]: nm-applet-Message: New secrets for CorporateNetwork/802-1x requested; ask the user 我能做些什么才能再次连接？
我在这里遇到了同样的问题：问题是wpa_supplicant 2.4，你可以在这里阅读： http ： //community.arubanetworks.com/t5/Unified-Wired-Wireless-Access/Internal-radius-server-incompatibility-with-the -new-WPA / TD-p / 236602
如果你降级到2.3这个问题就会解决！
问题是某些路由器和/或接入点使用具有弱DH密钥的WPA2 Enterprise，而网络管理器2.4不连接到这些网络。
通常这个问题发生在Ubuntu> = 15.10。 目前，临时解决方法是按照以下说明将wpa_supplicant降级为2.1（来自Ubuntu 15.04）：
echo "deb http://london.mirrors.linode.com/ubuntu/ vivid main" | sudo tee /etc/apt/sources.list.d/vivid.list echo -e "Package: *\nPin: release o=Ubuntu,n=vivid\nPin-Priority: -1" | sudo tee cat /etc/apt/preferences.d/vivid sudo apt-get update sudo apt-get install wpasupplicant=2.1-0ubuntu7 sudo apt-mark hold wpasupplicant sudo /etc/init.d/network-manager restart
参考文献：