[{"data":1,"prerenderedAt":215},["ShallowReactive",2],{"blog:vpn-keeps-disconnecting":3},{"zh-CN":4,"en":116},{"blocks":5,"faq":100},[6,9,11,15,17,24,26,29,31,35,37,40,42,53,56,58,66,69,71,73,75,78,80,84,86,89,91,93,96,98],{"type":7,"html":8},"p","连上没多久又断开，重连一下又能用，过一会儿再断——这种反复掉线比「完全连不上」更让人抓狂，因为每次看起来都像已经修好了。原因大多集中在三个地方：系统在后台把连接掐断、网络切换的瞬间掉线，或者节点本身当时不稳定。",{"type":7,"html":10},"排查前先明确一件事：偶尔断一次不算异常，任何网络都会有瞬断，重连一次就恢复完全正常。真正值得花时间查的，是一小时内反复断好几次，或者每次都要手动点重连才能恢复。原则照旧，每次只改一个变量，一次把系统设置、网络和节点全改了，断线消失也不知道是哪一步起的作用。",{"type":12,"id":13,"html":14},"h2","bp-triage","先分清是哪种断线",{"type":7,"html":16},"断线不是只有一种表现，先看清楚是哪一种，能直接排除大半原因。",{"type":18,"items":19},"list",[20,21,22,23],"锁屏或切到后台一段时间后断，回来才发现：多半是系统在后台把连接主动掐了，往下看原因一。","切换 Wi-Fi、切换到移动数据，或者两者之间来回跳的瞬间断了一下：这是网络切换本身导致的，往下看原因二。","什么都没动，用着用着突然断，而且断的时间点不固定：更可能是节点当时不稳定，往下看原因三。","断开以后一直连不回去，反复重连都失败：这已经不是「断线」，是连接层面出了别的问题，参考\u003Ca href=\"\u002Fblog\u002Fvpn-connected-but-no-internet\u002F\">VPN 显示已连接，却打不开网页\u003C\u002Fa>里更完整的排查顺序。",{"type":7,"html":25},"前三种都是这篇要讲的「断了还能重新连上」，第四种是另一类问题，方向完全不同，别混在一起查。判断的关键就是重连能不能成功：能重连，只是频率高，看这篇；重连本身就失败，看上面链的那篇。",{"type":12,"id":27,"html":28},"bp-background-kill","原因一：系统在后台把连接掐了",{"type":7,"html":30},"这是手机上最常见的断线原因，本质是系统为了省电或者省内存，主动结束了后台应用的网络连接，VPN 客户端也在其中。",{"type":32,"id":33,"html":34},"h3","sub-1","手机上最常见",{"type":7,"html":36},"安卓系统，尤其是部分国产厂商的定制系统，省电策略普遍比较激进：锁屏几分钟后，非白名单应用的网络活动会被限制甚至直接断开。表现就是锁屏时间越长，回来越容易发现已经断开。iOS 相对宽松，但长时间锁屏、开启低电量模式之后也会出现类似情况。",{"type":32,"id":38,"html":39},"sub-2","电脑上不太一样",{"type":7,"html":41},"电脑上更常见的是系统休眠或者网络适配器的省电设置：笔记本合盖、进入睡眠状态后网络连接整体中断，唤醒后需要重新建立。这和手机的「后台限制」是两件事，但结果看起来很像，都是「放一会儿不用就断了」。部分笔记本还会在电池模式下自动降低网络适配器的性能，同样会表现成连接不稳定，只是没那么容易被察觉是电源设置在起作用。",{"type":43,"items":44},"steps",[45,49],{"title":46,"body":47},"怎么确认",[48],"放着不用几分钟，回来看是不是必定断开；如果每次都断，且断开时间和锁屏或休眠的时长明显相关，基本可以确认是这个原因。",{"title":50,"body":51},"怎么处理",[52],"手机上把 VPN 客户端加入后台运行白名单或者关闭它的省电限制，位置通常在电池或者应用管理设置里。电脑上检查网络适配器的电源管理选项，取消「允许系统关闭此设备以节省电源」一类的勾选。这类设置改一次就一直有效，不需要每次手动处理。",{"type":12,"id":54,"html":55},"bp-network-switch","原因二：网络切换的瞬间断线",{"type":7,"html":57},"从 Wi-Fi 切到移动数据，或者在两个 Wi-Fi 之间漫游，设备的网络接口会短暂重建，这个过程中原有的连接会断一次，属于正常现象。问题在于有些情况下重连没有跟上，断线之后没有自动恢复。",{"type":43,"items":59},[60,63],{"title":46,"body":61},[62],"留意断线是不是总发生在切换网络的那一刻——比如出门离开家里 Wi-Fi 信号范围、进电梯信号切换基站。如果断线和这类动作强相关，而不是随机发生，基本可以确认是这个原因。",{"title":50,"body":64},[65],"网络切换导致的瞬断本身不需要处理，等自动重连完成就行，正常情况下几秒内会恢复。如果发现切换后长时间没有恢复，先检查是不是新网络本身有问题（比如新连上的 Wi-Fi 需要先登录门户页），而不是反复重启 VPN 客户端。",{"type":12,"id":67,"html":68},"bp-node-unstable","原因三：节点当时不稳定",{"type":7,"html":70},"排除了后台管理和网络切换，剩下的断线大多是节点或者它所在线路当时的问题：可能是负载突然升高，也可能是上游线路短暂波动。这种断线通常没有规律，什么都没做突然就断了，过一会儿又恢复正常。",{"type":7,"html":72},"判断方法很简单：断开后换一个不同地区的节点，观察半小时到一小时。如果换完就不再反复断，说明确实是节点的问题；如果换了地区还是一样频繁断，问题就不在节点上，该回头看前两个原因有没有漏查，而不是继续换第三个、第四个节点。选节点具体该看哪个地区，\u003Ca href=\"\u002Fblog\u002Fvpn-server-location-explained\u002F\">服务器选哪个地区最合适\u003C\u002Fa>里有更完整的建议。",{"type":74},"downloads",{"type":12,"id":76,"html":77},"bp-router-security","容易被忽略的两个原因",{"type":7,"html":79},"排除了前三个常见原因，断线依然反复出现，还有两个不算罕见但容易被忽略的可能性。",{"type":18,"items":81},[82,83],"路由器的 NAT 表有超时机制，连接闲置一段时间不发送数据，路由器会把这条记录清掉，下次发送数据时看起来就像断线重连。这类断线往往发生在长时间没有操作之后，和用不用 VPN 关系不大。","电脑上装的安全软件或者防火墙，对它不认识的新连接可能会重置而不是放行，尤其是刚装了新的安全工具或者更新之后。判断方法是临时关闭这类软件测试一段时间，如果断线明显减少，就是它在起作用。",{"type":7,"html":85},"这两条单独出现的概率不算高，但排除前三项以后还没解决，值得挨个试一下，比继续怀疑节点更有效率。路由器超时可以通过在路由器设置里调高连接保持时间来缓解，具体选项名称因品牌而异，找不到的话换一台支持自定义 NAT 超时的路由器也是一个思路。",{"type":12,"id":87,"html":88},"bp-device-itself","什么时候该怀疑设备本身",{"type":7,"html":90},"如果断线是从某次系统更新之后才开始出现的，之前一直正常，这种情况下先怀疑更新本身，而不是重新走一遍上面所有排查步骤。系统升级有时会改变后台管理策略或者网络驱动的行为，导致原来没问题的设置突然出问题。\u003Ca href=\"\u002Fblog\u002Fvpn-after-system-update\u002F\">系统升级后 VPN 不工作了\u003C\u002Fa>专门讲了这类情况该怎么处理。",{"type":7,"html":92},"同样的道理，换新设备以后如果开始频繁断线，先对照旧设备的电池和网络设置有没有同步过去，很多时候只是新设备的省电策略默认更严格，调回来就好，不是网络或者账号出了问题。这类设置一般不会自动迁移，换设备当天花两分钟检查一遍，比用了几天才发现问题划算。",{"type":12,"id":94,"html":95},"bp-final","总结",{"type":7,"html":97},"反复断线先分清是哪一种：后台被系统掐断、网络切换瞬断，还是节点当时不稳定，三者的表现和处理方式完全不同，混在一起查只会越查越乱。排除了这三项还没解决，再看路由器超时和安全软件冲突这两个容易被忽略的角落。",{"type":7,"html":99},"减少断线频率最直接的办法，是让客户端自己处理好重连这件事，不需要你每次都手动点。\u003Ca href=\"\u002Ffeatures\u002F\">快橙\u003C\u002Fa>断线后会自动尝试重连，换节点也是点一下就行。如果按上面的顺序查完还是频繁断线，把大致的断线规律（比如是不是总在固定时间、固定动作之后）告诉\u003Ca href=\"\u002Fcontact\u002F\">客服\u003C\u002Fa>，会比自己反复试错更快找到原因。",[101,104,107,110,113],{"q":102,"a":103},"断线以后会自动重连吗？","会。多数情况下客户端检测到断开会自动尝试重连，不需要手动点。如果发现完全没反应，那本身就是异常，值得单独排查，而不是等它自己恢复。",{"q":105,"a":106},"是不是国产手机更容易掉线？","部分国产安卓的省电策略确实比 iOS 更激进，锁屏或切到后台以后更容易把非系统应用的网络连接主动断开，这和网络本身无关，是系统在替你「省电」。",{"q":108,"a":109},"锁屏或黑屏后特别容易断，怎么办？","多数手机可以单独给某个 App 关闭省电限制，或者把它加进后台运行的白名单，位置一般在电池设置里，具体路径因品牌而异。",{"q":111,"a":112},"换了 Wi-Fi 或者从 Wi-Fi 切到移动数据就断一下，正常吗？","正常。网络切换的瞬间本身就会断线重连一次，这是网络层面的正常现象，重连很快完成就不用管。切换后长时间连不回去，才需要另外排查。",{"q":114,"a":115},"多久断一次才算不正常？","偶尔一次不算异常，网络本身就会有瞬断。如果一小时内反复断好几次，或者每次都要手动重连才恢复，才值得按下面的原因逐一排查。",{"blocks":117,"faq":199},[118,120,122,124,126,132,134,136,138,141,143,146,148,158,160,162,170,172,174,176,177,179,181,185,187,189,191,193,195,197],{"type":7,"html":119},"Connects, drops a minute later, reconnects and works, drops again a while after — this kind of repeated dropping is more frustrating than never connecting at all, because every time it looks fixed. The cause is usually one of three things: the system killing the connection in the background, a brief drop during a network switch, or the node itself being unstable at that moment.",{"type":7,"html":121},"One thing worth settling before you start: an occasional single drop is not unusual, since any network has brief interruptions, and reconnecting once is completely normal. What is actually worth your time is several drops within an hour, or drops that need a manual reconnect every single time. The rule still holds: change one variable at a time. Change a system setting, the network and the node all together, and even if the dropping stops you will not know which change did it.",{"type":12,"id":13,"html":123},"Start by telling the drops apart",{"type":7,"html":125},"Disconnects do not all look the same, and identifying which kind you have rules out most of the causes immediately.",{"type":18,"items":127},[128,129,130,131],"It drops after the screen is locked or the app sits in the background for a while, and you only notice when you come back: most likely the system actively killing the connection in the background. See cause one below.","It drops for a moment right when you switch Wi-Fi, switch to mobile data, or bounce between the two: this is the network switch itself. See cause two below.","Nothing changed, you are actively using it, and it just drops at no particular time: more likely the node being unstable at that moment. See cause three below.","Once it drops, it will not reconnect no matter how many times you retry: this is not really "disconnecting" anymore, it is a different connection-layer problem. See \u003Ca href=\"\u002Fen\u002Fblog\u002Fvpn-connected-but-no-internet\u002F\">VPN connected but no internet\u003C\u002Fa> for that full sequence.",{"type":7,"html":133},"The first three are all "drops but reconnects," which is what this article covers. The fourth is a different problem entirely, so do not mix them up. The test is simply whether reconnecting succeeds: if it does, and it is just happening often, keep reading here; if reconnecting itself fails, read the article linked above instead.",{"type":12,"id":27,"html":135},"Cause one: the system is killing it in the background",{"type":7,"html":137},"This is the single most common cause on phones. The system, trying to save power or memory, actively ends a background app's network connection — and the VPN client is one of those apps.",{"type":32,"id":139,"html":140},"on-phones-this-is-the-usual-case","On phones, this is the usual case",{"type":7,"html":142},"Android, especially some Chinese manufacturers' custom skins, tends to run noticeably aggressive power management: a few minutes after the screen locks, a non-allowlisted app's network activity gets throttled or cut outright. The longer the screen stays locked, the more likely you come back to a dropped connection. iOS is comparatively lenient, but long lock periods or low-power mode can produce something similar.",{"type":32,"id":144,"html":145},"on-computers-it-looks-a-little-different","On computers, it looks a little different",{"type":7,"html":147},"On a computer, the more common version is system sleep or a network adapter's power-saving setting: closing a laptop lid or letting it sleep cuts the whole network connection, which then has to be rebuilt on wake. That is a different mechanism from a phone's background restrictions, but the result looks similar; leave it idle for a while and it drops. Some laptops also throttle the network adapter automatically on battery power, which shows up as instability without it being obvious that a power setting is the cause.",{"type":43,"items":149},[150,154],{"title":151,"body":152},"How to confirm it",[153],"Leave the device idle for a few minutes and check whether it reliably drops. If it drops every time, and the timing lines up with how long the screen was locked or the device was asleep, that confirms this cause.",{"title":155,"body":156},"How to fix it",[157],"On phones, add the VPN client to the background-activity allowlist or turn off battery restrictions for it: usually somewhere in battery or app-management settings. On computers, check the network adapter's power-management options and uncheck anything like "allow the system to turn off this device to save power." These settings only need changing once; they do not need touching again after that.",{"type":12,"id":54,"html":159},"Cause two: a brief drop during a network switch",{"type":7,"html":161},"Switching from Wi-Fi to mobile data, or roaming between two Wi-Fi networks, briefly rebuilds the device's network interface, and the existing connection drops once during that process — this is normal. The actual problem is when reconnection does not keep up and the drop never recovers on its own.",{"type":43,"items":163},[164,167],{"title":151,"body":165},[166],"Notice whether the drops consistently line up with a network switch: walking out of home Wi-Fi range, or a cell tower handoff in an elevator. If the drops correlate strongly with actions like these rather than happening at random, this is the cause.",{"title":155,"body":168},[169],"A brief drop from a network switch does not need fixing: let the automatic reconnect finish, which normally takes a few seconds. If it stays disconnected for a while after switching, check whether the new network itself has a problem first (a newly joined Wi-Fi that needs a portal login, for instance) rather than repeatedly restarting the VPN client.",{"type":12,"id":67,"html":171},"Cause three: the node was briefly unstable",{"type":7,"html":173},"Once background management and network switching are ruled out, most remaining drops trace back to the node or the route it sits on at that moment — a sudden spike in load, or a brief wobble somewhere upstream. This kind of drop usually has no pattern: nothing changed, it just dropped, and it recovers a little later on its own.",{"type":7,"html":175},"The test is simple: after a drop, switch to a node in a different region and watch it for thirty minutes to an hour. If the dropping stops, it really was the node. If it keeps happening just as often in a different region, the problem is not the node — go back and check the first two causes more carefully instead of trying a third or fourth node. For which region actually makes sense to sit on, \u003Ca href=\"\u002Fen\u002Fblog\u002Fvpn-server-location-explained\u002F\">Choosing a server location\u003C\u002Fa> has fuller guidance.",{"type":74},{"type":12,"id":76,"html":178},"Two causes that are easy to overlook",{"type":7,"html":180},"If the first three common causes are ruled out and the dropping still will not stop, there are two more possibilities that are not exactly rare but are easy to miss.",{"type":18,"items":182},[183,184],"A router's NAT table has a timeout: if a connection sits idle without sending data for a while, the router clears the entry, and the next bit of data looks like a fresh disconnect-and-reconnect. This kind of drop tends to happen after a stretch of no activity, and has little to do with the VPN itself.","Security software or a firewall on a computer may reset a connection it does not recognise instead of letting it through, especially right after installing or updating one. Test by disabling it temporarily for a while; if dropping clearly decreases, that was it.",{"type":7,"html":186},"Neither of these is especially likely on its own, but if the first three causes did not solve it, they are worth testing one at a time — more productive than continuing to suspect the node. A router timeout can usually be eased by raising the connection-keepalive setting in the router's own settings (the exact option name varies by brand); if you cannot find it, a router that supports a custom NAT timeout is worth considering.",{"type":12,"id":87,"html":188},"When to suspect the device itself",{"type":7,"html":190},"If the dropping only started after a specific system update, and everything was fine before that, suspect the update itself first rather than repeating every step above from scratch. An OS upgrade sometimes changes background-management policy or network-driver behaviour, breaking a setting that used to work fine. \u003Ca href=\"\u002Fen\u002Fblog\u002Fvpn-after-system-update\u002F\">VPN stopped working after a system update\u003C\u002Fa> covers exactly this case.",{"type":7,"html":192},"The same logic applies to a new device: if frequent dropping starts right after switching, check whether your old device's battery and network settings carried over — often the new device's power-saving defaults are simply stricter, and adjusting them fixes it with nothing wrong with the network or the account. These settings rarely migrate automatically, so two minutes checking on day one beats noticing the problem days later.",{"type":12,"id":94,"html":194},"In summary",{"type":7,"html":196},"When dropping keeps happening, separate it into one of three kinds first: killed in the background, a brief switch-triggered drop, or a node that was briefly unstable. Each looks and gets fixed differently, and mixing them up just makes the search messier. If all three are ruled out, check the router timeout and security-software conflict in the corner above — both easy to overlook.",{"type":7,"html":198},"The most direct way to see fewer drops is to let the client handle reconnecting on its own instead of tapping through it every time. \u003Ca href=\"\u002Fen\u002Ffeatures\u002F\">FastOrange\u003C\u002Fa> tries to reconnect automatically after a drop, and switching nodes is just as quick. If you have worked through the order above and it is still dropping often, tell \u003Ca href=\"\u002Fen\u002Fcontact\u002F\">support\u003C\u002Fa> roughly when it happens: a fixed time of day, or right after a specific action — that is more useful than continuing to test it yourself.",[200,203,206,209,212],{"q":201,"a":202},"Does it reconnect on its own after dropping?","Yes, in most cases the client detects the drop and tries to reconnect automatically. You should not need to tap anything. If you notice it just sits there disconnected, that is itself unusual and worth checking on its own rather than waiting it out.",{"q":204,"a":205},"Do phones from Chinese Android brands disconnect more often?","Some Chinese Android skins do run noticeably more aggressive battery management than iOS, and are more likely to actively kill a non-system app's network connection once the screen locks or it goes to the background. That is the system 'saving power' on your behalf, not a network fault.",{"q":207,"a":208},"It drops a lot right after the screen locks. What can I do?","Most phones let you exempt a specific app from battery restrictions, or add it to a background-activity allowlist. It is usually somewhere in battery settings, though the exact path differs by brand.",{"q":210,"a":211},"It drops briefly when I switch Wi-Fi or move from Wi-Fi to mobile data. Is that normal?","Yes. The moment a network switches, a brief disconnect-and-reconnect is a normal, expected part of it. As long as it reconnects quickly, there is nothing to worry about. It is only worth investigating further if it stays disconnected for a while after the switch.",{"q":213,"a":214},"How often is too often?","One occasional drop is not unusual — any network has brief interruptions. If it happens several times within an hour, or every drop needs a manual reconnect to recover, that is when it is worth working through the causes below one at a time.",1793276292168]