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* [配置 IKEv2 VPN 客户端](#配置-ikev2-vpn-客户端)
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* [管理客户端证书](#管理客户端证书)
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* [手动在 VPN 服务器上配置 IKEv2](#手动在-vpn-服务器上配置-ikev2)
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* [已知问题](#已知问题)
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* [故障排除](#故障排除)
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* [移除 IKEv2](#移除-ikev2)
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* [参考链接](#参考链接)
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@ -82,7 +82,7 @@ To customize IKEv2 or client options, run this script without arguments.
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另外，你也可以手动导入 `.p12` 文件。详细步骤请看 <a href="https://wiki.strongswan.org/projects/strongswan/wiki/Win7Certs" target="_blank">这里</a>。在导入证书后，你必须确保将客户端证书放在 "个人 -> 证书" 目录中，并且将 CA 证书放在 "受信任的根证书颁发机构 -> 证书" 目录中。
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**注：** Ubuntu 18.04 用户在尝试导入 `.p12` 文件时可能会遇到错误 "输入的密码不正确"。参见 [已知问题](#已知问题)。
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**注：** Ubuntu 18.04 用户在尝试导入 `.p12` 文件时可能会遇到错误 "输入的密码不正确"。参见 [故障排除](#故障排除)。
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1. 在 Windows 计算机上添加一个新的 IKEv2 VPN 连接。对于 Windows 8.x 和 10，推荐从命令提示符运行以下命令创建 VPN 连接，以达到更佳的安全性和性能。
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要连接到 VPN：单击系统托盘中的无线/网络图标，选择新的 VPN 连接，然后单击 **连接**。连接成功后，你可以到 <a href="https://www.ipchicken.com" target="_blank">这里</a> 检测你的 IP 地址，应该显示为`你的 VPN 服务器 IP`。
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如果在连接过程中遇到错误，请参见 <a href="clients-zh.md#故障排除" target="_blank">故障排除</a>。
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如果在连接过程中遇到错误，请参见 [故障排除](#故障排除)。
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### OS X (macOS)
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连接成功后，你可以到 <a href="https://www.ipchicken.com" target="_blank">这里</a> 检测你的 IP 地址，应该显示为`你的 VPN 服务器 IP`。
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如果在连接过程中遇到错误，请参见 <a href="clients-zh.md#故障排除" target="_blank">故障排除</a>。
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如果在连接过程中遇到错误，请参见 [故障排除](#故障排除)。
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### iOS
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连接成功后，你可以到 <a href="https://www.ipchicken.com" target="_blank">这里</a> 检测你的 IP 地址，应该显示为`你的 VPN 服务器 IP`。
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如果在连接过程中遇到错误，请参见 <a href="clients-zh.md#故障排除" target="_blank">故障排除</a>。
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如果在连接过程中遇到错误，请参见 [故障排除](#故障排除)。
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### Android
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连接成功后，你可以到 <a href="https://www.ipchicken.com" target="_blank">这里</a> 检测你的 IP 地址，应该显示为`你的 VPN 服务器 IP`。
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如果在连接过程中遇到错误，请参见 <a href="clients-zh.md#故障排除" target="_blank">故障排除</a>。
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如果在连接过程中遇到错误，请参见 [故障排除](#故障排除)。
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## 管理客户端证书
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在继续之前，你**必须**重启 IPsec 服务。VPN 服务器上的 IKEv2 配置到此已完成。下一步：[配置 VPN 客户端](#配置-ikev2-vpn-客户端)。
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## 已知问题
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## 故障排除
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1. Windows 自带的 VPN 客户端可能不支持 IKEv2 fragmentation（该功能<a href="https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-ikee/74df968a-7125-431d-9c98-4ea929e548dc" target="_blank">需要</a> Windows 10 v1803 或更新版本）。在有些网络上，这可能会导致连接错误或其它连接问题。你可以尝试换用 <a href="clients-zh.md" target="_blank">IPsec/L2TP</a> 或 <a href="clients-xauth-zh.md" target="_blank">IPsec/XAuth</a> 模式。
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1. Ubuntu 18.04 用户在尝试将生成的 `.p12` 文件导入到 Windows 时可能会遇到错误 "输入的密码不正确"。这是由 `NSS` 中的一个问题导致的。更多信息请看 <a href="https://github.com/hwdsl2/setup-ipsec-vpn/issues/414#issuecomment-460495258" target="_blank">这里</a>。
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### 在导入客户端配置文件时提示密码不正确
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如果你忘记了客户端配置文件的密码，可以重新 [导出 IKEv2 客户端的配置](#导出一个已有的客户端的配置)。
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Ubuntu 18.04 用户在尝试将生成的 `.p12` 文件导入到 Windows 时可能会遇到错误 "输入的密码不正确"。这是由 `NSS` 中的一个问题导致的。更多信息请看 <a href="https://github.com/hwdsl2/setup-ipsec-vpn/issues/414#issuecomment-460495258" target="_blank">这里</a>。
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<details>
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<summary>
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Ubuntu 18.04 上的 NSS 问题的解决方法
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然后重新 [导出 IKEv2 客户端的配置](#导出一个已有的客户端的配置)。
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</details>
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### IKEv2 在一小时后断开连接
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如果 IKEv2 连接在一小时（60 分钟）后自动断开，可以这样解决：编辑 VPN 服务器上的 `/etc/ipsec.d/ikev2.conf`（如果不存在，编辑 `/etc/ipsec.conf`）。在 `conn ikev2-cp` 一节的末尾添加以下行，开头必须空两格：
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```
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ikelifetime=24h
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salifetime=24h
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```
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保存修改并运行 `service ipsec restart`。该解决方案已在 2021-01-20 添加到辅助脚本。
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### 无法同时连接多个 IKEv2 客户端
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如果要同时连接多个客户端，则必须为每个客户端 [生成唯一的证书](#添加一个客户端证书)。
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如果你无法同时连接同一个 NAT （比如家用路由器）后面的多个 IKEv2 客户端，可以这样解决：编辑 VPN 服务器上的 `/etc/ipsec.d/ikev2.conf`，找到这一行 `leftid=@<your_server_ip>` 并去掉 `@`，也就是说将它替换为 `leftid=<your_server_ip>`。保存修改并运行 `service ipsec restart`。如果 `leftid` 是一个域名则不受影响，不要应用这个解决方案。该解决方案已在 2021-02-01 添加到辅助脚本。
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### 其它已知问题
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1. Windows 自带的 VPN 客户端可能不支持 IKEv2 fragmentation（该功能<a href="https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-ikee/74df968a-7125-431d-9c98-4ea929e548dc" target="_blank">需要</a> Windows 10 v1803 或更新版本）。在有些网络上，这可能会导致连接错误或其它连接问题。你可以尝试换用 <a href="clients-zh.md" target="_blank">IPsec/L2TP</a> 或 <a href="clients-xauth-zh.md" target="_blank">IPsec/XAuth</a> 模式。
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1. 如果你使用 strongSwan Android VPN 客户端，则必须将服务器上的 Libreswan <a href="../README-zh.md#升级libreswan" target="_blank">升级</a>到版本 3.26 或以上。
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### 更多故障排除信息
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要查看更多故障排除信息，请看 <a href="clients-zh.md#故障排除" target="_blank">这里</a>。
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## 移除 IKEv2
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如果你想要从 VPN 服务器移除 IKEv2，但是保留 [IPsec/L2TP](clients-zh.md) 和 [IPsec/XAuth ("Cisco IPsec")](clients-xauth-zh.md) 模式，请重新运行 [辅助脚本](#使用辅助脚本) 并选择 "Remove IKEv2" 选项。请注意，这将删除所有的 IKEv2 配置（包括证书和密钥），并且**不可撤销**！
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* [Configure IKEv2 VPN clients](#configure-ikev2-vpn-clients)
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* [Manage client certificates](#manage-client-certificates)
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* [Manually set up IKEv2 on the VPN server](#manually-set-up-ikev2-on-the-vpn-server)
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* [Known issues](#known-issues)
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* [Troubleshooting](#troubleshooting)
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* [Remove IKEv2](#remove-ikev2)
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* [References](#references)
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Alternatively, you can manually import the `.p12` file. Click <a href="https://wiki.strongswan.org/projects/strongswan/wiki/Win7Certs" target="_blank">here</a> for instructions. Make sure that the client cert is placed in "Personal -> Certificates", and the CA cert is placed in "Trusted Root Certification Authorities -> Certificates".
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**Note:** Ubuntu 18.04 users may encounter the error "The password you entered is incorrect" when trying to import the `.p12` file. See [Known issues](#known-issues).
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**Note:** Ubuntu 18.04 users may encounter the error "The password you entered is incorrect" when trying to import the `.p12` file. See [Troubleshooting](#troubleshooting).
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1. On the Windows computer, add a new IKEv2 VPN connection. For Windows 8.x and 10, it is recommended to create the VPN connection using the following commands from a command prompt, for improved security and performance.
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To connect to the VPN: Click on the wireless/network icon in your system tray, select the new VPN entry, and click **Connect**. Once successfully connected, you can verify that your traffic is being routed properly by <a href="https://www.google.com/search?q=my+ip" target="_blank">looking up your IP address on Google</a>. It should say "Your public IP address is `Your VPN Server IP`".
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If you get an error when trying to connect, see <a href="clients.md#troubleshooting" target="_blank">Troubleshooting</a>.
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If you get an error when trying to connect, see [Troubleshooting](#troubleshooting).
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### OS X (macOS)
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Once successfully connected, you can verify that your traffic is being routed properly by <a href="https://www.google.com/search?q=my+ip" target="_blank">looking up your IP address on Google</a>. It should say "Your public IP address is `Your VPN Server IP`".
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If you get an error when trying to connect, see <a href="clients.md#troubleshooting" target="_blank">Troubleshooting</a>.
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If you get an error when trying to connect, see [Troubleshooting](#troubleshooting).
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### iOS
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Once successfully connected, you can verify that your traffic is being routed properly by <a href="https://www.google.com/search?q=my+ip" target="_blank">looking up your IP address on Google</a>. It should say "Your public IP address is `Your VPN Server IP`".
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If you get an error when trying to connect, see <a href="clients.md#troubleshooting" target="_blank">Troubleshooting</a>.
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If you get an error when trying to connect, see [Troubleshooting](#troubleshooting).
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### Android
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@ -260,7 +260,7 @@ If you manually set up IKEv2 without using the helper script, click here for ins
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Once successfully connected, you can verify that your traffic is being routed properly by <a href="https://www.google.com/search?q=my+ip" target="_blank">looking up your IP address on Google</a>. It should say "Your public IP address is `Your VPN Server IP`".
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If you get an error when trying to connect, see <a href="clients.md#troubleshooting" target="_blank">Troubleshooting</a>.
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If you get an error when trying to connect, see [Troubleshooting](#troubleshooting).
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## Manage client certificates
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Before continuing, you **must** restart the IPsec service. The IKEv2 setup on the VPN server is now complete. Follow instructions to [configure VPN clients](#configure-ikev2-vpn-clients).
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## Known issues
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## Troubleshooting
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1. The built-in VPN client in Windows may not support IKEv2 fragmentation (this feature <a href="https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-ikee/74df968a-7125-431d-9c98-4ea929e548dc" target="_blank">requires</a> Windows 10 v1803 or newer). On some networks, this can cause the connection to fail or have other issues. You may instead try the <a href="clients.md" target="_blank">IPsec/L2TP</a> or <a href="clients-xauth.md" target="_blank">IPsec/XAuth</a> mode.
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1. Ubuntu 18.04 users may encounter the error "The password you entered is incorrect" when trying to import the generated `.p12` file into Windows. This is due to a bug in `NSS`. Read more <a href="https://github.com/hwdsl2/setup-ipsec-vpn/issues/414#issuecomment-460495258" target="_blank">here</a>.
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### Incorrect password when trying to import client config files
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If you forgot the password for client config files, you may [export configuration for the IKEv2 client](#export-configuration-for-an-existing-client) again.
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Ubuntu 18.04 users may encounter the error "The password you entered is incorrect" when trying to import the generated `.p12` file into Windows. This is due to a bug in `NSS`. Read more <a href="https://github.com/hwdsl2/setup-ipsec-vpn/issues/414#issuecomment-460495258" target="_blank">here</a>.
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<details>
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<summary>
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Workaround for the NSS bug on Ubuntu 18.04
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After that, [export configuration for the IKEv2 client](#export-configuration-for-an-existing-client) again.
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</details>
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### IKEv2 disconnects after one hour
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If the IKEv2 connection disconnects automatically after one hour (60 minutes), apply this fix: Edit `/etc/ipsec.d/ikev2.conf` on the VPN server (or `/etc/ipsec.conf` if it does not exist), append these lines to the end of section `conn ikev2-cp`, indented by two spaces:
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```
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ikelifetime=24h
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salifetime=24h
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```
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Save the file and run `service ipsec restart`. As of 2021-01-20, the IKEv2 helper script was updated to include this fix.
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### Unable to connect multiple IKEv2 clients
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To connect multiple IKEv2 clients simultaneously, you must [generate a unique certificate](#add-a-client-certificate) for each.
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If you are unable to connect multiple IKEv2 clients simultaneously from behind the same NAT (e.g. home router), apply this fix: Edit `/etc/ipsec.d/ikev2.conf` on the VPN server, find the line `leftid=@<your_server_ip>` and remove the `@`, i.e. replace it with `leftid=<your_server_ip>`. Save the file and run `service ipsec restart`. Do not apply this fix if `leftid` is a DNS name, which is not affected. As of 2021-02-01, the IKEv2 helper script was updated to include this fix.
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### Other known issues
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1. The built-in VPN client in Windows may not support IKEv2 fragmentation (this feature <a href="https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-ikee/74df968a-7125-431d-9c98-4ea929e548dc" target="_blank">requires</a> Windows 10 v1803 or newer). On some networks, this can cause the connection to fail or have other issues. You may instead try the <a href="clients.md" target="_blank">IPsec/L2TP</a> or <a href="clients-xauth.md" target="_blank">IPsec/XAuth</a> mode.
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1. If using the strongSwan Android VPN client, you must <a href="../README.md#upgrade-libreswan" target="_blank">update Libreswan</a> on your server to version 3.26 or above.
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### Additional troubleshooting
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Click <a href="clients.md#troubleshooting" target="_blank">here</a> for additional troubleshooting information.
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## Remove IKEv2
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If you want to remove IKEv2 from the VPN server, but keep the [IPsec/L2TP](clients.md) and [IPsec/XAuth ("Cisco IPsec")](clients-xauth.md) modes, run the [helper script](#using-helper-scripts) again and select the "Remove IKEv2" option. Note that this will delete all IKEv2 configuration including certificates and keys, and **cannot be undone**!
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