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當(dāng)我們使用VPS（Virtual Private Server，虛擬專用服務(wù)器）時(shí)，可能會(huì)遇到無(wú)法連接網(wǎng)絡(luò)的問(wèn)題，這可能是由于多種原因?qū)е碌模缇W(wǎng)絡(luò)設(shè)置錯(cuò)誤、防火墻限制等，本文將詳細(xì)介紹如何解決VPS連不上網(wǎng)絡(luò)的問(wèn)題。

檢查網(wǎng)絡(luò)設(shè)置

1、確認(rèn)IP地址和子網(wǎng)掩碼是否正確，在VPS上執(zhí)行以下命令查看IP地址和子網(wǎng)掩碼：

ifconfig

2、確認(rèn)網(wǎng)關(guān)地址是否正確，在VPS上執(zhí)行以下命令查看網(wǎng)關(guān)地址：

route n

3、確認(rèn)DNS服務(wù)器地址是否正確，在VPS上執(zhí)行以下命令查看DNS服務(wù)器地址：

cat /etc/resolv.conf

檢查防火墻設(shè)置

1、檢查VPS上的防火墻是否允許SSH連接，在VPS上執(zhí)行以下命令查看防火墻規(guī)則：

iptables L n | grep 22

如果防火墻沒(méi)有允許SSH連接，可以使用以下命令開(kāi)放端口：

iptables A INPUT p tcp dport 22 j ACCEPT
iptablessave > /etc/iptables/rules.v4
service iptables save
service iptables restart

2、檢查本地計(jì)算機(jī)的防火墻是否允許SSH連接，在本地計(jì)算機(jī)上執(zhí)行以下命令查看防火墻規(guī)則：

Windows系統(tǒng)：

netstat ano | findstr "22"

macOS系統(tǒng)：

sudo lsof i :22

如果本地計(jì)算機(jī)的防火墻沒(méi)有允許SSH連接，需要修改防火墻設(shè)置以允許連接。

重啟網(wǎng)絡(luò)服務(wù)

1、重啟VPS上的網(wǎng)絡(luò)服務(wù)，在VPS上執(zhí)行以下命令重啟網(wǎng)絡(luò)服務(wù)：

service network restart

2、重啟本地計(jì)算機(jī)的網(wǎng)絡(luò)服務(wù)，在本地計(jì)算機(jī)上執(zhí)行以下命令重啟網(wǎng)絡(luò)服務(wù)：

Windows系統(tǒng)：

netsh winsock reset catalog
netsh int ip reset reset.log hit && netsh int ipv4 reset reset.log hit && netsh int ipv6 reset reset.log hit && netsh winsock reset loglevel=5 || netsh winsock reset catalog || netsh int ip reset reset.log hit && netsh int ipv4 reset reset.log hit && netsh int ipv6 reset reset.log hit && netsh winsock reset loglevel=5 || netsh int ipv4 reset reset.log hit && netsh int ipv6 reset reset.log hit || netsh winsock reset loglevel=5 || netsh int ip reset reset.log hit || netsh int ipv4 reset reset.log hit || netsh int ipv6 reset reset.log hit || echo "Resetting Winsock failed." && exit 1 || echo "Resetting Winsock succeeded." && exit 0 || echo "Resetting Winsock failed." && exit 1 || echo "Resetting Winsock succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resetting IP succeeded." && exit 0 || echo "Resetting IP failed." && exit 1 || echo "Resettting Winsock and resetting all network components has been completed successfully!" | OutNull) ErrorAction SilentlyContinue WarningAction SilentlyContinue InformationAction SilentlyContinue Verbose DebuggerNonUserCodeExecution Force ErrorAction Stop | WriteHost NoNewline ForegroundColor Green; RestartComputer Force ErrorAction Stop | WriteHost NoNewline ForegroundColor Green; StartSleep Seconds 5; WriteHost NoNewline ForegroundColor Red; WriteHost 'The computer will now be restarted to complete the resetting of network components!'; StartSleep Seconds 5; WriteHost NoNewline ForegroundColor Red; WriteHost 'Please save your work and close any open applications before continuing!'; StartSleep Seconds 5; WriteHost 'Press any key to continue...'; $host = [System.Console]::ReadKey(); RestartComputer Force ErrorAction Stop | WriteHost NoNewline ForegroundColor Green; StartSleep Seconds 5; WriteHost NoNewline ForegroundColor Red; WriteHost 'The computer is now restarting...'; StartSleep Seconds

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