{"id":725,"date":"2016-01-03T20:52:28","date_gmt":"2016-01-03T19:52:28","guid":{"rendered":"https:\/\/katastrophos.net\/andre\/blog\/?p=725"},"modified":"2016-01-04T16:21:40","modified_gmt":"2016-01-04T15:21:40","slug":"windows-10-th2-wifiwlan-autoconfig-scan-bug","status":"publish","type":"post","link":"https:\/\/katastrophos.net\/andre\/blog\/2016\/01\/03\/windows-10-th2-wifiwlan-autoconfig-scan-bug\/","title":{"rendered":"Windows 10 TH2 Wifi\/WLAN AutoConfig scan bug"},"content":{"rendered":"<p>Ever since upgrading my two Windows machines (Asus UX301 ultrabook and Lenovo ThinkPad 8 tablet) to Windows 10 the Wifi throughput and latencies have been a mixed bag. Throughput is fluctuating and latency skyrocketing to 100ms periodically every 10-30 seconds. The bug is pretty similar to the one in Windows 7 ages ago where the operating system would continue scanning for available networks every few seconds, thus interfering with the current Wifi connection. The issue looks like this (iperf measurement + Task Manager graph for Wifi connection):<\/p>\n<p><a href=\"https:\/\/katastrophos.net\/andre\/blog\/wp-content\/uploads\/2016\/01\/W10WifiScanBugBefore.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/katastrophos.net\/andre\/blog\/wp-content\/uploads\/2016\/01\/W10WifiScanBugBefore.png\" alt=\"W10WifiScanBugBefore\" width=\"1598\" height=\"766\" class=\"aligncenter size-full wp-image-729\" srcset=\"https:\/\/katastrophos.net\/andre\/blog\/wp-content\/uploads\/2016\/01\/W10WifiScanBugBefore.png 1598w, https:\/\/katastrophos.net\/andre\/blog\/wp-content\/uploads\/2016\/01\/W10WifiScanBugBefore-150x72.png 150w, https:\/\/katastrophos.net\/andre\/blog\/wp-content\/uploads\/2016\/01\/W10WifiScanBugBefore-300x144.png 300w, https:\/\/katastrophos.net\/andre\/blog\/wp-content\/uploads\/2016\/01\/W10WifiScanBugBefore-1024x491.png 1024w\" sizes=\"(max-width: 1598px) 100vw, 1598px\" \/><\/a><\/p>\n<p>The drop in throughput is also where the latency is increasing to a point where VNC and even SSH connections are no longer interactive.<\/p>\n<p>After tuning my access point&#8217;s and Wifi adapters&#8217; settings to no avail, I started looking for running services on Windows 10 that might cause these interferences and lo and behold restarting the service &#8220;WlanSvc&#8221; (WLAN Auto Config) fixed the issue. I am now employing a task that does this on startup of the machine.<\/p>\n<p><a href=\"https:\/\/katastrophos.net\/andre\/blog\/wp-content\/uploads\/2016\/01\/W10WifiScanBugAfter.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/katastrophos.net\/andre\/blog\/wp-content\/uploads\/2016\/01\/W10WifiScanBugAfter.png\" alt=\"W10WifiScanBugAfter\" width=\"1566\" height=\"766\" class=\"aligncenter size-full wp-image-728\" srcset=\"https:\/\/katastrophos.net\/andre\/blog\/wp-content\/uploads\/2016\/01\/W10WifiScanBugAfter.png 1566w, https:\/\/katastrophos.net\/andre\/blog\/wp-content\/uploads\/2016\/01\/W10WifiScanBugAfter-150x73.png 150w, https:\/\/katastrophos.net\/andre\/blog\/wp-content\/uploads\/2016\/01\/W10WifiScanBugAfter-300x147.png 300w, https:\/\/katastrophos.net\/andre\/blog\/wp-content\/uploads\/2016\/01\/W10WifiScanBugAfter-1024x501.png 1024w\" sizes=\"(max-width: 1566px) 100vw, 1566px\" \/><\/a><\/p>\n<p>Alternatively you can manually enable\/disable WLAN autoconfig on all interfaces. This can be used during and after connecting to the Wifi network:<\/p>\n<pre name=\"code\">\r\nnetsh wlan set autoconfig enable=no interface=*\r\n<\/pre>\n<p>to disable autoconfig after making the connection.<\/p>\n<pre name=\"code\">\r\nnetsh wlan set autoconfig enable=yes interface=*\r\n<\/pre>\n<p>to connect to other wireless LANs again afterwards.<\/p>\n<p>Microsoft, get your crap sorted out!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ever since upgrading my two Windows machines (Asus UX301 ultrabook and Lenovo ThinkPad 8 tablet) to Windows 10 the Wifi throughput and latencies have been a mixed bag. Throughput is fluctuating and latency skyrocketing to 100ms periodically every 10-30 seconds. The bug is pretty similar to the one in Windows 7 ages ago where the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-725","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/katastrophos.net\/andre\/blog\/wp-json\/wp\/v2\/posts\/725"}],"collection":[{"href":"https:\/\/katastrophos.net\/andre\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/katastrophos.net\/andre\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/katastrophos.net\/andre\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/katastrophos.net\/andre\/blog\/wp-json\/wp\/v2\/comments?post=725"}],"version-history":[{"count":10,"href":"https:\/\/katastrophos.net\/andre\/blog\/wp-json\/wp\/v2\/posts\/725\/revisions"}],"predecessor-version":[{"id":739,"href":"https:\/\/katastrophos.net\/andre\/blog\/wp-json\/wp\/v2\/posts\/725\/revisions\/739"}],"wp:attachment":[{"href":"https:\/\/katastrophos.net\/andre\/blog\/wp-json\/wp\/v2\/media?parent=725"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/katastrophos.net\/andre\/blog\/wp-json\/wp\/v2\/categories?post=725"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/katastrophos.net\/andre\/blog\/wp-json\/wp\/v2\/tags?post=725"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}