{"id":1351,"date":"2026-04-02T16:46:35","date_gmt":"2026-04-02T08:46:35","guid":{"rendered":"https:\/\/www.ygcloud.com\/knowledge\/?p=1351"},"modified":"2026-04-02T16:46:35","modified_gmt":"2026-04-02T08:46:35","slug":"%e7%be%8e%e5%9b%bd%e6%9c%8d%e5%8a%a1%e5%99%a8ssh%e7%99%bb%e5%bd%95%e4%b8%8d%e4%ba%86%ef%bc%9f%e8%bf%996%e4%b8%aa%e5%8e%9f%e5%9b%a0%e6%9c%80%e5%b8%b8%e8%a7%81%ef%bc%8c%e4%b8%80%e4%b8%aa%e4%b8%aa","status":"publish","type":"post","link":"https:\/\/www.ygcloud.com\/knowledge\/1351\/","title":{"rendered":"\u7f8e\u56fd\u670d\u52a1\u5668SSH\u767b\u5f55\u4e0d\u4e86\uff1f\u8fd96\u4e2a\u539f\u56e0\u6700\u5e38\u89c1\uff0c\u4e00\u4e2a\u4e2a\u6392\u67e5\u5c11\u8d70\u5f2f\u8def"},"content":{"rendered":"<p><!-- obsidian --><\/p>\n<p>SSH\u767b\u5f55\u5931\u8d25\u7684\u539f\u56e0\u5f88\u591a\uff0c\u4f46\u6392\u67e5\u601d\u8def\u662f\u56fa\u5b9a\u7684\uff1a\u5148\u67e5\u672c\u5730\u7aef\u7684\u8f93\u5165\u9519\u8bef\uff0c\u518d\u67e5\u670d\u52a1\u5668\u7aef\u7684\u914d\u7f6e\u95ee\u9898\uff0c\u6700\u540e\u8003\u8651\u7f51\u7edc\u5c42\u9762\u7684\u9650\u5236\u3002\u6309\u8fd9\u4e2a\u987a\u5e8f\u67e5\uff0c\u80fd\u5c11\u8d70\u5f88\u591a\u5f2f\u8def\u3002<\/p>\n<h2 data-heading=\"\u516d\u79cd\u6700\u5e38\u89c1\u7684\u767b\u5f55\u5931\u8d25\u539f\u56e0\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1352\" src=\"https:\/\/www.ygcloud.com\/knowledge\/wp-content\/uploads\/2026\/04\/834562ceb60b8e7-1024x765.jpg\" alt=\"\" width=\"700\" height=\"523\" srcset=\"https:\/\/www.ygcloud.com\/knowledge\/wp-content\/uploads\/2026\/04\/834562ceb60b8e7-1024x765.jpg 1024w, https:\/\/www.ygcloud.com\/knowledge\/wp-content\/uploads\/2026\/04\/834562ceb60b8e7-300x224.jpg 300w, https:\/\/www.ygcloud.com\/knowledge\/wp-content\/uploads\/2026\/04\/834562ceb60b8e7-768x573.jpg 768w, https:\/\/www.ygcloud.com\/knowledge\/wp-content\/uploads\/2026\/04\/834562ceb60b8e7.jpg 1200w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/>\u516d\u79cd\u6700\u5e38\u89c1\u7684\u767b\u5f55\u5931\u8d25\u539f\u56e0<\/h2>\n<p><strong>\u7b2c\u4e00\u79cd\uff1a\u8d26\u53f7\u6216\u5bc6\u7801\u9519\u8bef<\/strong><\/p>\n<p>\u8fd9\u662f\u6700\u5e38\u89c1\u7684SSH\u767b\u5f55\u5931\u8d25\u539f\u56e0\uff0c\u4f46\u4e5f\u662f\u6700\u5bb9\u6613\u88ab\u5ffd\u7565\u7684\u2014\u2014\u56e0\u4e3a\u5f88\u591a\u4eba\u8f93\u5165\u65f6\u591a\u6253\u4e86\u4e2a\u7a7a\u683c\u6216\u8005\u8bb0\u6df7\u4e86\u3002\u5e38\u89c1\u62a5\u9519\u662f <code>Permission denied (password)<\/code>\u3002<\/p>\n<p>\u89e3\u51b3\u529e\u6cd5\u662f\u786e\u8ba4\u7528\u6237\u540d\u662f<code>root<\/code>\u8fd8\u662f\u5176\u4ed6\u975eroot\u7528\u6237\uff0c\u786e\u8ba4\u5bc6\u7801\u6ca1\u6709\u591a\u4f59\u7a7a\u683c\uff0c\u901a\u8fc7\u4e91\u63a7\u5236\u53f0\u7684VNC\u754c\u9762\uff08\u6551\u751f\u5e2d\uff09\u767b\u5f55\u540e\u624b\u52a8\u91cd\u7f6e\u5bc6\u7801\uff1a<code>passwd root<\/code>\u3002<\/p>\n<p><strong>\u7b2c\u4e8c\u79cd\uff1a\u7aef\u53e3\u53f7\u4e0d\u662f\u9ed8\u8ba4\u768422<\/strong><\/p>\n<p>\u5f88\u591a\u4e91\u670d\u52a1\u5546\u9ed8\u8ba4\u4e0d\u4f7f\u752822\u7aef\u53e3\uff0c\u800c\u662f\u968f\u673a\u751f\u6210\u4e00\u4e2a\u9ad8\u4f4d\u7aef\u53e3\u6bd4\u5982<code>20222<\/code>\u3001<code>37221<\/code>\u3002\u76f4\u63a5\u7528<code>ssh root@IP<\/code>\u8fde\u63a5\uff0c\u9ed8\u8ba4\u4f1a\u53bb\u8fde22\uff0c\u81ea\u7136\u8fde\u4e0d\u4e0a\u3002\u5e38\u89c1\u62a5\u9519\u662f <code>Connection refused<\/code>\u3002<\/p>\n<p>\u89e3\u51b3\u529e\u6cd5\u662f\u53bb\u4e91\u63a7\u5236\u53f0\u67e5\u770b\u5b9e\u4f8b\u8be6\u60c5\u627e\u5230&#8221;SSH\u7aef\u53e3&#8221;\u5b57\u6bb5\uff0c\u8fde\u63a5\u65f6\u6307\u5b9a\u7aef\u53e3\uff1a<code>ssh -p 37221 root@\u4f60\u7684\u670d\u52a1\u5668IP<\/code>\u3002<\/p>\n<p><strong>\u7b2c\u4e09\u79cd\uff1a\u5b89\u5168\u7ec4\u6ca1\u6709\u5f00\u653eSSH\u7aef\u53e3<\/strong><\/p>\n<p>\u8fd9\u662f\u56fd\u5185\u4e91\u670d\u52a1\u5668SSH\u767b\u5f55\u5931\u8d25\u7684\u5934\u53f7\u539f\u56e0\uff0c\u6ca1\u6709\u4e4b\u4e00\u3002\u4e91\u670d\u52a1\u5668\u7684\u5b89\u5168\u7ec4\u9ed8\u8ba4\u89c4\u5219\u901a\u5e38\u662f\u62d2\u7edd\u6240\u6709\u5165\u7ad9\u6d41\u91cf\uff0c\u9700\u8981\u624b\u52a8\u5f00\u653eSSH\u7aef\u53e3\u3002\u5e38\u89c1\u62a5\u9519\u662f <code>Connection timed out<\/code>\u3002<\/p>\n<p>\u89e3\u51b3\u529e\u6cd5\u662f\u767b\u5f55\u4e91\u63a7\u5236\u53f0 \u2192 \u5b89\u5168\u7ec4 \u2192 \u5165\u7ad9\u89c4\u5219 \u2192 \u6dfb\u52a0\u89c4\u5219\uff1a\u534f\u8bae\u9009TCP\uff0c\u7aef\u53e3\u586b22\u6216\u4f60\u7684\u81ea\u5b9a\u4e49\u7aef\u53e3\uff0c\u6765\u6e90\u586b0.0.0.0\/0\u6216\u4f60\u7684IP\u5730\u5740\uff0c\u4fdd\u5b58\u540e\u7b49\u5f851-2\u5206\u949f\u751f\u6548\u3002<\/p>\n<p><strong>\u7b2c\u56db\u79cd\uff1a\u5bc6\u94a5\u6587\u4ef6\u4e0d\u5339\u914d<\/strong><\/p>\n<p>\u4f7f\u7528SSH\u5bc6\u94a5\u767b\u5f55\u65f6\uff0c\u5e38\u89c1\u7684\u95ee\u9898\u662f\u516c\u94a5\u6ca1\u6709\u6b63\u786e\u5199\u5165\u670d\u52a1\u5668\u6216\u8005\u672c\u5730\u79c1\u94a5\u6587\u4ef6\u6743\u9650\u4e0d\u5bf9\u3002\u5e38\u89c1\u62a5\u9519\u662f <code>Permission denied (publickey)<\/code>\u3002<\/p>\n<p>\u89e3\u51b3\u529e\u6cd5\u662f\u786e\u8ba4\u516c\u94a5\u5df2\u7ecf\u5199\u5165\u670d\u52a1\u5668<code>~\/.ssh\/authorized_keys<\/code>\uff0c\u786e\u8ba4\u79c1\u94a5\u6587\u4ef6\u6743\u9650\u6b63\u786e\uff08600\uff09\uff1a<code>chmod 600 ~\/.ssh\/id_rsa<\/code>\uff0c\u4f7f\u7528<code>-i<\/code>\u53c2\u6570\u6307\u5b9a\u79c1\u94a5\u6587\u4ef6\uff1a<code>ssh -i ~\/.ssh\/\u4f60\u7684\u79c1\u94a5\u6587\u4ef6 root@\u670d\u52a1\u5668IP<\/code>\u3002<\/p>\n<p><strong>\u7b2c\u4e94\u79cd\uff1a\u670d\u52a1\u5668SSH\u670d\u52a1\u672a\u8fd0\u884c<\/strong><\/p>\n<p>\u670d\u52a1\u5668\u5982\u679c\u9047\u5230\u5f02\u5e38\u91cd\u542f\u3001\u8d44\u6e90\u8017\u5c3d\u7b49\u60c5\u51b5\uff0cSSH\u670d\u52a1\u53ef\u80fd\u6ca1\u6709\u81ea\u52a8\u542f\u52a8\uff0c\u5bfc\u81f4\u5b8c\u5168\u65e0\u6cd5\u901a\u8fc7SSH\u767b\u5f55\u3002\u5e38\u89c1\u62a5\u9519\u662f <code>Connection refused<\/code>\u3002<\/p>\n<p>\u89e3\u51b3\u529e\u6cd5\u662f\u901a\u8fc7\u4e91\u63a7\u5236\u53f0\u7684VNC\u6216\u6551\u751f\u5e2d\u767b\u5f55\uff0c\u68c0\u67e5SSH\u670d\u52a1\u72b6\u6001\uff1a<code>systemctl status sshd<\/code>\u3002\u5982\u679c\u670d\u52a1\u672a\u8fd0\u884c\uff0c\u7528<code>systemctl start sshd<\/code>\u542f\u52a8\uff0c\u5e76\u7528<code>systemctl enable sshd<\/code>\u8bbe\u7f6e\u5f00\u673a\u81ea\u542f\u3002<\/p>\n<p><strong>\u7b2c\u516d\u79cd\uff1aIP\u88abfail2ban\u5c01\u7981<\/strong><\/p>\n<p>\u670d\u52a1\u5668\u5f00\u542f\u4e86fail2ban\u6216\u7c7b\u4f3c\u7684\u767b\u5f55\u4fdd\u62a4\uff0c\u8fde\u7eed\u8f93\u9519\u5bc6\u7801\u51e0\u6b21\u540e\u5f53\u524dIP\u4f1a\u88ab\u4e34\u65f6\u5c01\u7981\u3002\u5e38\u89c1\u62a5\u9519\u662f <code>ssh_exchange_identification: Connection closed by remote host<\/code>\u3002<\/p>\n<p>\u89e3\u51b3\u529e\u6cd5\u662f\u7b4910-15\u5206\u949f\u81ea\u52a8\u89e3\u5c01\uff0c\u6216\u901a\u8fc7VNC\u767b\u5f55\u540e\u624b\u52a8\u89e3\u5c01IP\uff1a<code>fail2ban-client set sshd unbanip \u4f60\u7684IP<\/code>\u3002<\/p>\n<h2 data-heading=\"\u8fdb\u9636\u6392\u67e5\u65b9\u6cd5\">\u8fdb\u9636\u6392\u67e5\u65b9\u6cd5<\/h2>\n<p>\u5982\u679c\u4ee5\u4e0a\u90fd\u67e5\u5b8c\u4e86\u8fd8\u662f\u8fde\u4e0d\u4e0a\uff0c\u7528\u8fd9\u4e9b\u65b9\u6cd5\u8fdb\u4e00\u6b65\u5b9a\u4f4d\u3002<\/p>\n<p>\u67e5\u770bSSH\u65e5\u5fd7\u3002\u901a\u8fc7VNC\u767b\u5f55\u670d\u52a1\u5668\u540e\uff0cCentOS\/RHEL\u7cfb\u7edf\u7528<code>tail -f \/var\/log\/secure<\/code>\uff0cUbuntu\/Debian\u7cfb\u7edf\u7528<code>tail -f \/var\/log\/auth.log<\/code>\uff0c\u5c1d\u8bd5\u767b\u5f55\u5e76\u89c2\u5bdf\u65e5\u5fd7\u91cc\u7684\u5177\u4f53\u62a5\u9519\u4fe1\u606f\u3002<\/p>\n<p>\u672c\u5730\u7aef\u53e3\u68c0\u6d4b\u5728\u672c\u673a\u6267\u884c\u7aef\u53e3\u68c0\u6d4b\uff0cLinux\/Mac\u7528<code>nc -zv \u670d\u52a1\u5668IP \u7aef\u53e3<\/code>\uff0cWindows PowerShell\u7528<code>Test-NetConnection -ComputerName \u670d\u52a1\u5668IP -Port \u7aef\u53e3<\/code>\u3002\u5982\u679c\u663e\u793a<code>Connection refused<\/code>\u8bf4\u660e\u7aef\u53e3\u6ca1\u5f00\u653e\u6216\u670d\u52a1\u6ca1\u8fd0\u884c\uff1b\u5982\u679c<code>Connection timed out<\/code>\u8bf4\u660e\u662f\u7f51\u7edc\u5c42\uff08\u9632\u706b\u5899\/\u5b89\u5168\u7ec4\uff09\u62e6\u622a\u3002<\/p>\n<p>\u8def\u7531\u8ffd\u8e2a\u7528<code>traceroute \u670d\u52a1\u5668IP<\/code>\uff08Linux\/Mac\uff09\u6216<code>tracert \u670d\u52a1\u5668IP<\/code>\uff08Windows\uff09\u67e5\u770b\u8def\u7531\u662f\u5426\u6b63\u5e38\u3002<\/p>\n<h2 data-heading=\"\u4f60\u53ef\u80fd\u5728\u60f3\">\u4f60\u53ef\u80fd\u5728\u60f3<\/h2>\n<p><strong>SSH\u8fde\u63a5\u663e\u793aPermission denied\u600e\u4e48\u89e3\u51b3\uff1f<\/strong><\/p>\n<p>\u5148\u786e\u8ba4\u7528\u6237\u540d\u662froot\u8fd8\u662f\u5176\u4ed6\u7528\u6237\uff0c\u518d\u786e\u8ba4\u5bc6\u7801\u6ca1\u6709\u591a\u4f59\u7a7a\u683c\u3002\u7528VNC\u767b\u5f55\u670d\u52a1\u5668\u76f4\u63a5\u91cd\u7f6e\u5bc6\u7801\u6700\u53ef\u9760\u3002<\/p>\n<p><strong>\u5b89\u5168\u7ec4\u5df2\u7ecf\u5f00\u653e\u4e8622\u7aef\u53e3\u8fd8\u662f\u8fde\u4e0d\u4e0a\u600e\u4e48\u529e\uff1f<\/strong><\/p>\n<p>\u68c0\u67e5\u670d\u52a1\u5668\u5185\u90e8\u7684iptables\u6216firewalld\u89c4\u5219\uff0c\u7528<code>firewall-cmd --list-all<\/code>\u6216<code>iptables -L -n | grep 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