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这条错误信息本身无法说明是谁关闭了连接，也不能证明 Minecraft 客户端有故障。Mojang 旧版问题跟踪器列出的可能原因包括电脑上的程序拦截连接、网络设置异常，或服务器端问题。先比较受影响的服务器、玩家和网络，再按结果检查对应环节；以下步骤针对 Java 版相关报告，不应假定其他版本或平台的设置完全相同。
错误信息能说明什么？
当 Minecraft Java 版显示“Internal Exception: java.io.IOException: An existing connection was forcibly closed by the remote host”（内部异常：远程主机强制关闭了现有连接）时，意思是连接被关闭了；单凭这句话，无法判断关闭连接的具体设备或原因。Mojang 旧版问题跟踪器将一条相同错误报告归为技术支持问题，而非 Minecraft 缺陷，并指出可能涉及电脑上的程序、网络设置或服务器：Mojang 旧版问题跟踪器。
其他玩家报告过不同情形：有人称在多个服务器上都会卡顿并断开，而其他玩家没有同样的问题；另有 Windows 10 Java 版用户描述游戏时互联网连接中断。这些是个别经历，不足以证明某种原因普遍存在或某项修复一定有效：Minecraft Forum 讨论、Microsoft Q&A 讨论。
先判断问题影响范围
在改设置前，记录版本、发生时间和受影响范围。比较下面三个方面，有助于决定先检查自己的电脑与网络，还是联系服务器管理员。这是依据可能故障位置作出的排查思路，并非经过验证的诊断测试，也不能单独证明根因。
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#1 Best Overall
Sale
Elebase USB to USB C Adapter for iPhone 18 Pro Max,USBC Car Charger Adapter
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
- 服务器范围：是只有一个服务器断开，还是多个服务器都会断开？
- 玩家范围：只有你掉线，还是同一服务器上的多人也受影响？
- 网络范围：其他应用也会断网吗？如果条件允许，同一台设备换用另一种网络后，问题是否仍然出现？
如果你在多个服务器上掉线，而其他玩家正常，先查自己的设备和网络更有针对性。如果同一服务器上的多人都掉线，应请服务器管理员检查服务器及其网络。以上判断是缩小排查范围的线索，不是对故障位置的确诊。
按顺序排查并修复
1. 记录错误与出现时机
记下错误原文、Minecraft 版本、服务器地址或名称、是刚连接就断开还是游玩一段时间后发生，以及其他玩家或应用是否也掉线。若只在一个服务器出现，记录这一点；若多个服务器都有问题，也一并注明。
Rank #2
Sale
Anker USB-C Hub, 5-in-1 USB Hub for Laptops, 4K HDMI Multiport Adapter
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
2. 检查安全软件与防火墙规则
检查电脑上的安全软件或防火墙是否拦截了当前 Minecraft/Java 连接。优先检查现有规则并确认允许规则对应的是正在使用的程序和连接；若进行临时对照测试，应一次只改一个设置，并在测试后恢复正常防护。不要把关闭防火墙当作长期解决方案。Mojang 跟踪器将电脑程序列为一种可能原因；检查防火墙是社区讨论中提出的排查方向，并非保证有效的官方修复：Minecraft Forum 社区讨论。
3. 对照另一种网络
如果可行，让同一台设备通过另一种网络连接相同服务器，再比较结果。若错误只在原网络出现，网络环境或设置值得进一步调查；若换网后仍然出现，电脑、游戏连接或服务器仍可能相关。这个对照只能帮助定位方向，不能单独确定具体原因。不要因为一次 Wi-Fi 相关的个人报告，就认定需要购买路由器或无线网卡。
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Rank #3
Sale
Anker USB C Hub, 7in1 Multi-Port USB Adapter, 4K@60Hz USBC to HDMI Splitter
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
4. 联系服务器管理员或支持渠道
若排查后仍掉线，把以下信息发给服务器管理员或适当的支持渠道，便于对方判断是否与服务器端或特定连接有关：
- 错误的完整文字、Minecraft 版本及所用版本类型；
- 服务器名称或地址，以及断开是立即发生还是游玩后发生；
- 问题是否只影响这一台设备、这一个服务器，或同一服务器上的多名玩家；
- 其他互联网应用是否也断开，以及是否试过另一种网络；
- 已经检查或更改过的安全软件、防火墙和网络设置。
哪些做法不应当当作默认修复
现有报告没有证明重装 Java 或 Minecraft、更换路由器或购买网络设备能普遍解决这个错误，也没有提供某种操作的成功率。Wi-Fi 干扰的说法来自个别社区经历，不能据此推断你的连接问题也由干扰造成。应先依据问题是否跨服务器、跨玩家或跨网络出现来排查，而不是直接购买设备或重装软件。
Quick Recap
Best Value
Sale
Anker USB C Hub, 5-in-1 USBC to HDMI Splitter with 4K Display
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
Sale
UGREEN USB to USB C Adapter Combo 4-Pack, 10Gbps USB C Converter Space Gray
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
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