{"id":33839,"date":"2026-11-09T12:00:00","date_gmt":"2026-11-09T04:00:00","guid":{"rendered":"https:\/\/cn.hostease.com\/blog\/?p=33839"},"modified":"2026-10-29T21:37:35","modified_gmt":"2026-10-29T13:37:35","slug":"ssh-connection-slow-dns-usedns-troubleshooting","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/blog\/guides\/ssh-connection-slow-dns-usedns-troubleshooting\/","title":{"rendered":"SSH\u8fde\u63a5\u53d8\u6162\u6392\u67e5\u6307\u5357\uff1aDNS\u53cd\u89e3\u3001UseDNS\u4e0e\u8ba4\u8bc1\u8017\u65f6\u5b9a\u4f4d"},"content":{"rendered":"<p>SSH\u767b\u5f55\u4e3a\u4ec0\u4e48\u8981\u7b49\u4e09\u5341\u79d2\u624d\u63d0\u793a\u8f93\u5165\u5bc6\u7801\uff1f\u8fd9\u4efd\u6392\u67e5\u6307\u5357\u5c06\u5e2e\u4f60\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff1a\u6267\u884c <code>ssh user@\u670d\u52a1\u5668IP<\/code> \u540e\uff0c\u7ec8\u7aef\u505c\u987f\u4e09\u5341\u79d2\u751a\u81f3\u4e00\u5206\u949f\u624d\u5f39\u51fa\u5bc6\u7801\u63d0\u793a\uff0c\u800c\u767b\u5f55\u4e4b\u540e\u64cd\u4f5c\u53c8\u4e00\u5207\u6b63\u5e38\u2014\u2014\u8fd9\u79cd&#8221;\u8fde\u63a5\u6162\u3001\u767b\u5f55\u540e\u4e0d\u6162&#8221;\u7684\u73b0\u8c61\uff0c\u662f\u670d\u52a1\u5668\u8fd0\u7ef4\u91cc\u6700\u5178\u578b\u4e5f\u6700\u5bb9\u6613\u8bef\u5224\u7684\u95ee\u9898\u4e4b\u4e00\u3002\u672c\u6587\u4f1a\u5e26\u4f60\u4e00\u6b65\u6b65\u5b9a\u4f4d SSH\uff08\u4e00\u79cd\u52a0\u5bc6\u7684\u8fdc\u7a0b\u767b\u5f55\u534f\u8bae\uff09\u8fde\u63a5\u53d8\u6162\u7684\u771f\u6b63\u539f\u56e0\uff0c\u91cd\u70b9\u8bb2\u6e05 DNS\uff08\u57df\u540d\u89e3\u6790\u7cfb\u7edf\uff09\u53cd\u5411\u89e3\u6790\u3001sshd \u7684 UseDNS \u53c2\u6570\u4ee5\u53ca\u8ba4\u8bc1\u8017\u65f6\u8fd9\u4e09\u4e2a\u65b9\u5411\uff0c\u5e76\u7ed9\u51fa\u53ef\u4ee5\u76f4\u63a5\u590d\u5236\u6267\u884c\u7684\u6392\u67e5\u547d\u4ee4\uff0c\u5e2e\u4f60\u628a\u767b\u5f55\u7b49\u5f85\u65f6\u95f4\u4ece\u51e0\u5341\u79d2\u538b\u56de\u5230\u4e00\u79d2\u4ee5\u5185\u3002<\/p>\n<h2>\u5148\u5206\u6e05\u6162\u5728\u54ea\u4e00\u6bb5\uff1a\u8fde\u63a5\u9636\u6bb5\u8fd8\u662f\u8ba4\u8bc1\u9636\u6bb5<\/h2>\n<p>\u5904\u7406 SSH \u53d8\u6162\uff0c\u7b2c\u4e00\u6b65\u4e0d\u662f\u6539\u914d\u7f6e\uff0c\u800c\u662f\u786e\u8ba4\u5ef6\u8fdf\u53d1\u751f\u5728\u54ea\u4e2a\u9636\u6bb5\u3002\u8fde\u63a5\u9636\u6bb5\u6162\uff0c\u901a\u5e38\u8868\u73b0\u4e3a <code>ssh<\/code> \u547d\u4ee4\u6267\u884c\u540e\u957f\u65f6\u95f4\u6ca1\u6709\u4efb\u4f55\u8f93\u51fa\uff1b\u8ba4\u8bc1\u9636\u6bb5\u6162\uff0c\u5219\u8868\u73b0\u4e3a\u5bc6\u7801\u63d0\u793a\u5df2\u7ecf\u51fa\u73b0\u3001\u8f93\u5165\u5bc6\u7801\u540e\u5361\u4f4f\u3002\u8fd9\u4e24\u7c7b\u7684\u6392\u67e5\u8def\u5f84\u5b8c\u5168\u4e0d\u540c\uff0c\u6df7\u5728\u4e00\u8d77\u731c\u53ea\u4f1a\u6d6a\u8d39\u65f6\u95f4\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/10\/ssh-connection-slow-cover.webp\" alt=\"SSH \u8fde\u63a5\u53d8\u6162\u6392\u67e5\u5c01\u9762\uff1a\u7ec8\u7aef\u4e0e\u670d\u52a1\u5668\u4e4b\u95f4\u56e0 DNS \u53cd\u89e3\u7b49\u5f85\u4ea7\u751f\u5ef6\u8fdf\" loading=\"lazy\" \/><\/p>\n<p>\u6700\u5feb\u7684\u5206\u6bb5\u5de5\u5177\u662f ssh \u81ea\u5e26\u7684\u8c03\u8bd5\u8f93\u51fa\u3002\u5728\u5ba2\u6237\u7aef\u6267\u884c\uff1a<\/p>\n<pre><code class=\"language-bash\">ssh -v user@your-server-ip\n<\/code><\/pre>\n<p>\u89c2\u5bdf\u8f93\u51fa\u505c\u5728\u54ea\u4e00\u884c\uff1a\u5982\u679c\u957f\u65f6\u95f4\u505c\u5728 <code>Connecting to ...<\/code> \u4e4b\u524d\uff0c\u95ee\u9898\u591a\u534a\u51fa\u5728\u7f51\u7edc\u8def\u5f84\u6216\u7aef\u53e3\u8fde\u901a\u6027\uff1b\u5982\u679c\u505c\u5728 <code>debug1: SSH2_MSG_SERVICE_ACCEPT received<\/code> \u4e4b\u540e\u8fdf\u8fdf\u4e0d\u89c1\u5bc6\u7801\u63d0\u793a\uff0c\u90a3\u4e48\u57fa\u672c\u53ef\u4ee5\u9501\u5b9a\u662f\u670d\u52a1\u5668\u7aef\u5728\u8ba4\u8bc1\u524d\u505a\u4e86\u989d\u5916\u52a8\u4f5c\u2014\u2014\u5176\u4e2d\u6700\u5e38\u89c1\u7684\u5c31\u662f DNS \u53cd\u5411\u89e3\u6790\u3002\u4e0b\u9762\u6211\u4eec\u6309\u8fd9\u4e2a\u601d\u8def\u9010\u6bb5\u5c55\u5f00\u3002<\/p>\n<h2>\u6700\u5e38\u89c1\u7684\u5143\u51f6\uff1aDNS \u53cd\u5411\u89e3\u6790\u8d85\u65f6<\/h2>\n<p>\u5927\u591a\u6570&#8221;\u7b49\u4e09\u5341\u79d2\u624d\u8981\u5bc6\u7801&#8221;\u7684\u6848\u4f8b\uff0c\u6839\u6e90\u90fd\u5728 sshd \u7684\u53cd\u5411\u89e3\u6790\u884c\u4e3a\u3002\u9ed8\u8ba4\u6216\u5386\u53f2\u914d\u7f6e\u4e0b\uff0csshd \u53ef\u80fd\u4f1a\u5bf9\u6765\u6e90 IP \u505a DNS\uff08\u57df\u540d\u89e3\u6790\u7cfb\u7edf\uff09\u53cd\u5411\u89e3\u6790\uff0c\u5c1d\u8bd5\u628a IP \u89e3\u6790\u56de\u4e3b\u673a\u540d\uff0c\u7528\u4e8e\u65e5\u5fd7\u8bb0\u5f55\u6216 <code>hosts.deny<\/code> \u5339\u914d\u3002\u5982\u679c\u670d\u52a1\u5668\u7684 DNS \u89e3\u6790\u5668\u54cd\u5e94\u6162\u6216\u4e0d\u53ef\u8fbe\uff0csshd \u4f1a\u4e00\u76f4\u7b49\u5230\u89e3\u6790\u8d85\u65f6\u624d\u7ee7\u7eed\u8ba4\u8bc1\u6d41\u7a0b\uff0c\u800c\u8fd9\u4e2a\u8d85\u65f6\u7a97\u53e3\u901a\u5e38\u5c31\u662f\u4e94\u79d2\u7684\u82e5\u5e72\u500d\uff0c\u4f53\u9a8c\u4e0a\u5c31\u662f&#8221;\u5361\u4f4f\u534a\u5206\u949f&#8221;\u3002<\/p>\n<p>\u786e\u8ba4\u8fd9\u4e00\u539f\u56e0\u6700\u76f4\u63a5\u7684\u8bc1\u636e\u5728\u670d\u52a1\u5668\u65e5\u5fd7\u91cc\u3002\u767b\u5f55\u670d\u52a1\u5668\u540e\u6267\u884c\uff1a<\/p>\n<pre><code class=\"language-bash\">sudo journalctl -u sshd --since &quot;10 minutes ago&quot; | grep -i &quot;dns\\|reverse&quot;\n# \u6216\u8f83\u8001\u7cfb\u7edf\uff1a\nsudo grep -i &quot;reverse mapping&quot; \/var\/log\/secure\n<\/code><\/pre>\n<p>\u5982\u679c\u65e5\u5fd7\u4e2d\u51fa\u73b0 <code>reverse mapping checking getaddrinfo for ... failed - POSSIBLE BREAK-IN ATTEMPT<\/code> \u8fd9\u7c7b\u8bb0\u5f55\uff0c\u8bf4\u660e\u53cd\u5411\u89e3\u6790\u786e\u5b9e\u5728\u53d1\u751f\u4e14\u5931\u8d25\u4e86\uff0c\u8fd9\u5c31\u662f\u5ef6\u8fdf\u6765\u6e90\u3002\u5224\u65ad\u4f9d\u636e\u8fd8\u6709\u4e00\u6761\u7ecf\u9a8c\u89c4\u5f8b\uff1a\u8fd9\u7c7b\u5ef6\u8fdf\u7684\u79d2\u6570\u5f80\u5f80\u63a5\u8fd1\u89e3\u6790\u8d85\u65f6\u7684\u56fa\u5b9a\u500d\u6570\uff08\u6bd4\u5982\u6070\u597d\u4e09\u5341\u79d2\u6216\u516d\u5341\u79d2\uff09\uff0c\u800c\u7f51\u7edc\u6296\u52a8\u9020\u6210\u7684\u5ef6\u8fdf\u5219\u662f\u968f\u673a\u6beb\u79d2\u7ea7\u6ce2\u52a8\u3002\u5982\u679c\u4f60\u7684\u7b49\u5f85\u65f6\u95f4\u6bcf\u6b21\u90fd\u5dee\u4e0d\u591a\u957f\uff0c\u57fa\u672c\u53ef\u4ee5\u6309\u89e3\u6790\u8d85\u65f6\u6765\u5904\u7406\u3002\u786e\u8ba4\u73b0\u8c61\u540e\uff0c\u4e0b\u4e00\u6b65\u5c31\u662f\u6539\u914d\u7f6e\u628a\u5b83\u5173\u6389\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/10\/ssh-connection-slow-diagnosis.webp\" alt=\"SSH \u53d8\u6162\u6392\u67e5\u6d41\u7a0b\uff1a\u5206\u6bb5\u5b9a\u4f4d\u3001\u65e5\u5fd7\u786e\u8ba4\u3001\u53c2\u6570\u4fee\u6539\u4e0e\u9a8c\u8bc1\" loading=\"lazy\" \/><\/p>\n<h2>\u5173\u95ed\u53cd\u5411\u89e3\u6790\uff1aUseDNS \u53c2\u6570\u7684\u6b63\u786e\u6539\u6cd5<\/h2>\n<p>\u5b9a\u4f4d\u5230\u53cd\u5411\u89e3\u6790\u95ee\u9898\u540e\uff0c\u4fee\u590d\u53ea\u9700\u8981\u4e00\u884c\u914d\u7f6e\u3002\u7f16\u8f91\u670d\u52a1\u5668\u4e0a\u7684 <code>\/etc\/ssh\/sshd_config<\/code>\uff0c\u627e\u5230\u6216\u6dfb\u52a0 <code>UseDNS<\/code> \u53c2\u6570\u5e76\u8bbe\u4e3a <code>no<\/code>\uff1a<\/p>\n<pre><code class=\"language-bash\">sudo grep -n &quot;^UseDNS\\|#UseDNS&quot; \/etc\/ssh\/sshd_config\n# \u4fee\u6539\u4e3a\uff1a\nUseDNS no\n# \u91cd\u8f7d\u914d\u7f6e\uff08\u4e0d\u5efa\u8bae\u76f4\u63a5 restart\uff0c\u907f\u514d\u65ad\u5f00\u73b0\u6709\u4f1a\u8bdd\uff09\uff1a\nsudo systemctl reload sshd\n<\/code><\/pre>\n<p>\u8fd9\u91cc\u6709\u4e24\u4e2a\u5bb9\u6613\u8e29\u7684\u5751\u3002\u7b2c\u4e00\uff0c\u5f88\u591a\u53d1\u884c\u7248\u9ed8\u8ba4\u914d\u7f6e\u91cc\u8fd9\u884c\u662f\u88ab <code>#<\/code> \u6ce8\u91ca\u6389\u7684\uff0c\u8868\u9762\u4e0a&#8221;\u6ca1\u6709\u914d\u7f6e&#8221;\uff0c\u5b9e\u9645\u884c\u4e3a\u7531\u7f16\u8bd1\u9ed8\u8ba4\u503c\u51b3\u5b9a\uff0c\u65e9\u671f\u7248\u672c\u9ed8\u8ba4\u5f00\u542f\u53cd\u5411\u89e3\u6790\uff0c\u6240\u4ee5\u5373\u4fbf\u6ce8\u91ca\u7740\u4e5f\u53ef\u80fd\u5728\u6162\uff1b\u663e\u5f0f\u5199 <code>UseDNS no<\/code> \u624d\u662f\u786e\u5b9a\u6027\u7684\u505a\u6cd5\u3002\u7b2c\u4e8c\uff0c\u6539\u5b8c\u8981\u9a8c\u8bc1\u914d\u7f6e\u8bed\u6cd5\u518d\u91cd\u8f7d\uff0c\u907f\u514d sshd \u8d77\u4e0d\u6765\uff1a<\/p>\n<pre><code class=\"language-bash\">sudo sshd -t &amp;&amp; echo &quot;config ok&quot;\n<\/code><\/pre>\n<p>\u7528 <code>reload<\/code> \u800c\u4e0d\u662f <code>restart<\/code> \u8fd8\u6709\u4e00\u4e2a\u597d\u5904\uff1a\u5df2\u7ecf\u5efa\u7acb\u7684\u4f1a\u8bdd\u4e0d\u4f1a\u88ab\u5207\u65ad\uff0c\u4f60\u53ef\u4ee5\u653e\u5fc3\u5728\u5f53\u524d\u8fde\u63a5\u91cc\u64cd\u4f5c\u3002\u91cd\u8f7d\u540e\u518d\u6d4b\u4e00\u6b21\u767b\u5f55\uff0c\u7edd\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u5bc6\u7801\u63d0\u793a\u4f1a\u5728\u4e00\u5230\u4e24\u79d2\u5185\u51fa\u73b0\u3002\u5982\u679c\u4f60\u7684\u7ad9\u70b9\u90e8\u7f72\u5728<a href=\"https:\/\/cn.hostease.com\/dedicated-server\/\">\u72ec\u7acb\u670d\u52a1\u5668<\/a>\u6216 <a href=\"https:\/\/cn.hostease.com\/vps\/\">VPS<\/a>\uff08<a href=\"https:\/\/cn.hostease.com\/vps\/\">\u865a\u62df\u4e13\u7528\u670d\u52a1\u5668<\/a>\uff09\u4e0a\uff0c\u767b\u5f55\u9a8c\u8bc1\u8fd9\u4e00\u6b65\u5efa\u8bae\u653e\u5728\u4e1a\u52a1\u4f4e\u5cf0\u671f\u6267\u884c\uff0c\u5148\u5728\u7b2c\u4e8c\u4f1a\u8bdd\u91cc\u786e\u8ba4\u65b0\u8fde\u63a5\u6b63\u5e38\u518d\u9000\u51fa\u65e7\u4f1a\u8bdd\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/10\/ssh-connection-slow-comparison.webp\" alt=\"\u5f00\u542f\u4e0e\u5173\u95ed UseDNS \u7684\u5bf9\u6bd4\uff1a\u7ecf\u53cd\u5411\u89e3\u6790\u7ed5\u884c\u4e0e\u76f4\u63a5\u8ba4\u8bc1\u7684\u5dee\u522b\" loading=\"lazy\" \/><\/p>\n<p>\u9700\u8981\u8bf4\u660e\u7684\u662f\uff0c\u5173\u95ed UseDNS \u53ea\u5f71\u54cd sshd \u662f\u5426\u505a\u53cd\u5411\u89e3\u6790\uff0c\u4e0d\u5f71\u54cd\u7cfb\u7edf\u5176\u4ed6\u670d\u52a1\u7684 DNS \u67e5\u8be2\uff0c\u5bf9\u6b63\u5e38\u4e1a\u52a1\u6ca1\u6709\u526f\u4f5c\u7528\uff1b\u5b83\u539f\u672c\u4f9d\u8d56\u7684\u4e3b\u673a\u540d\u6821\u9a8c\u573a\u666f\uff0c\u5982\u4eca\u57fa\u672c\u90fd\u88ab\u5bc6\u94a5\u8ba4\u8bc1\u548c\u9632\u706b\u5899\u89c4\u5219\u53d6\u4ee3\u4e86\u3002<\/p>\n<h2>\u6539\u4e86 UseDNS \u8fd8\u662f\u6162\uff1a\u7ee7\u7eed\u5b9a\u4f4d\u8ba4\u8bc1\u8017\u65f6<\/h2>\n<p>\u5982\u679c <code>UseDNS no<\/code> \u4e4b\u540e\u767b\u5f55\u4ecd\u7136\u5361\u987f\uff0c\u8bf4\u660e\u5ef6\u8fdf\u51fa\u5728\u8ba4\u8bc1\u94fe\u8def\u7684\u5176\u4ed6\u73af\u8282\uff0c\u8fd9\u4e00\u6bb5\u8981\u9760\u6253\u65f6\u95f4\u6233\u6765\u62c6\u89e3\u3002\u5ba2\u6237\u7aef\u518d\u5f00\u8c03\u8bd5\u6a21\u5f0f\uff0c\u91cd\u70b9\u770b\u4e24\u4e2a\u65f6\u95f4\u70b9\u4e4b\u95f4\u7684\u95f4\u9694\uff1a<\/p>\n<pre><code class=\"language-bash\">ssh -v -o GSSAPIAuthentication=no user@your-server-ip 2&gt;&amp;1 | ts '[%H:%M:%.s]'\n# \u6ca1\u6709 ts \u547d\u4ee4\u65f6\uff0c\u76f4\u63a5\u8089\u773c\u770b -v \u8f93\u51fa\u4e2d\u5404\u884c\u4e4b\u95f4\u7684\u505c\u987f\n<\/code><\/pre>\n<p>\u5b9e\u9645\u6392\u67e5\u4e2d\uff0c\u6700\u5e38\u89c1\u7684\u4e09\u4e2a\u6b8b\u7559\u539f\u56e0\u5982\u4e0b\u3002<\/p>\n<p>\u4e00\u662f GSSAPI \u8ba4\u8bc1\u3002\u90e8\u5206\u53d1\u884c\u7248\u9ed8\u8ba4\u5f00\u542f GSSAPI\uff08\u901a\u7528\u5b89\u5168\u670d\u52a1\u5e94\u7528\u63a5\u53e3\uff0c\u5e38\u7528\u4e8e Kerberos \u73af\u5883\uff09\uff0c\u5ba2\u6237\u7aef\u4f1a\u5148\u5c1d\u8bd5\u8fd9\u5957\u8ba4\u8bc1\uff0c\u670d\u52a1\u5668\u6ca1\u6709\u5bf9\u5e94\u73af\u5883\u65f6\u6bcf\u6b21\u90fd\u8981\u7b49\u5931\u8d25\u540e\u624d\u56de\u843d\u5230\u5bc6\u7801\u6216\u5bc6\u94a5\uff0c\u901a\u5e38\u591a\u51fa\u4e94\u5230\u5341\u79d2\u3002\u5728 <code>\/etc\/ssh\/sshd_config<\/code> \u4e0e\u5ba2\u6237\u7aef <code>~\/.ssh\/config<\/code> \u4e2d\u90fd\u663e\u5f0f\u8bbe <code>GSSAPIAuthentication no<\/code>\uff0c\u53ef\u4ee5\u7acb\u5373\u6d88\u9664\u8fd9\u90e8\u5206\u7b49\u5f85\u3002\u8fd9\u70b9\u5728\u8de8\u673a\u623f\u767b\u5f55\u6d77\u5916\u670d\u52a1\u5668\u65f6\u5c24\u5176\u660e\u663e\uff0c\u56e0\u4e3a\u6bcf\u6b21 GSSAPI \u5c1d\u8bd5\u90fd\u53d7\u94fe\u8def\u5f80\u8fd4\u65f6\u95f4\u653e\u5927\u3002<\/p>\n<p>\u4e8c\u662f\u5bc6\u94a5\u6587\u4ef6\u6743\u9650\u4e0e\u8ba4\u8bc1\u65b9\u5f0f\u5217\u8868\u3002\u5982\u679c\u5ba2\u6237\u7aef\u643a\u5e26\u4e86\u591a\u4e2a\u5bc6\u94a5\uff0csshd \u4f1a\u9010\u4e2a\u5c1d\u8bd5\uff0c\u670d\u52a1\u5668\u7aef <code>MaxAuthTries<\/code> \u8fbe\u5230\u4e0a\u9650\u540e\u8fd8\u4f1a\u65ad\u5f00\u91cd\u8fde\uff0c\u8868\u73b0\u4e3a&#8221;\u8f93\u4e00\u6b21\u5bc6\u7801\u8981\u7b49\u5f88\u4e45&#8221;\u3002\u7cbe\u7b80 <code>~\/.ssh\/config<\/code> \u4e2d <code>IdentityFile<\/code> \u7684\u6570\u91cf\u3001\u53ea\u4fdd\u7559\u5b9e\u9645\u4f7f\u7528\u7684\u5bc6\u94a5\uff0c\u80fd\u660e\u663e\u7f29\u77ed\u534f\u5546\u65f6\u95f4\u3002\u914d\u5957\u7684\u505a\u6cd5\u662f\u5728\u670d\u52a1\u5668\u4e0a\u7528 <code>sudo sshd -T | grep -i maxauthtries<\/code> \u6838\u5bf9\u5b9e\u9645\u751f\u6548\u503c\uff0c\u9ed8\u8ba4\u516d\u6b21\u5bf9\u4e8e\u591a\u5bc6\u94a5\u7528\u6237\u6765\u8bf4\u504f\u7d27\u3002<\/p>\n<p>\u4e09\u662f\u670d\u52a1\u5668\u8d1f\u8f7d\u4e0e\u78c1\u76d8 IO\u3002\u8ba4\u8bc1\u8981\u8bfb\u53d6\u7528\u6237\u4e3b\u76ee\u5f55\u4e0b\u7684\u6388\u6743\u6587\u4ef6\uff0c\u5982\u679c\u78c1\u76d8 IO \u9971\u548c\uff0c\u5355\u8fd9\u4e00\u6b65\u5c31\u53ef\u80fd\u5361\u4f4f\u5341\u51e0\u79d2\u3002\u7528 <code>iostat -x 1<\/code> \u770b\u5229\u7528\u7387\uff0c\u7528 <code>top<\/code> \u770b\u8d1f\u8f7d\u5373\u53ef\u5224\u65ad\u3002\u533a\u5206\u6280\u5de7\uff1a\u8d1f\u8f7d\u5bfc\u81f4\u7684\u6162\u901a\u5e38\u540c\u65f6\u5f71\u54cd SFTP\uff08\u5b89\u5168\u6587\u4ef6\u4f20\u8f93\u534f\u8bae\uff09\u4f20\u8f93\u548c\u7f51\u9875\u54cd\u5e94\uff0c\u800c\u89e3\u6790\u8d85\u65f6\u5bfc\u81f4\u7684\u6162\u53ea\u5f71\u54cd\u767b\u5f55\u77ac\u95f4\u3002<\/p>\n<h2>\u4e00\u4efd\u53ef\u590d\u7528\u7684\u6392\u67e5\u5bf9\u7167\u6e05\u5355<\/h2>\n<p>\u628a\u4f60\u73af\u5883\u91cc\u7684\u73b0\u8c61\u548c\u4e0b\u9762\u7684\u5bf9\u7167\u5173\u7cfb\u9010\u9879\u6838\u5bf9\uff0c\u80fd\u8986\u76d6\u7edd\u5927\u591a\u6570 SSH \u53d8\u6162\u573a\u666f\uff1a<\/p>\n<ul>\n<li>\u5361\u5728\u5bc6\u7801\u63d0\u793a\u4e4b\u524d\u7ea6 30 \u79d2\uff1asshd \u53cd\u5411\u89e3\u6790\u8d85\u65f6\uff0c\u8bbe <code>UseDNS no<\/code> \u5e76 reload \u751f\u6548<\/li>\n<li>\u5bc6\u7801\u9a8c\u8bc1\u540e\u53c8\u505c 5-10 \u79d2\u624d\u8fdb shell\uff1aGSSAPI \u8ba4\u8bc1\u7a7a\u8f6c\uff0c\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u90fd\u5173\u95ed <code>GSSAPIAuthentication<\/code><\/li>\n<li>\u5076\u5c14\u6162\u3001\u5076\u5c14\u5feb\uff1a\u670d\u52a1\u5668 DNS \u89e3\u6790\u5668\u4e0d\u7a33\u5b9a\uff0c\u68c0\u67e5 <code>\/etc\/resolv.conf<\/code> \u91cc\u7684\u89e3\u6790\u5668\u54cd\u5e94\u65f6\u95f4\uff0c<code>dig @\u89e3\u6790\u5668IP \u67d0\u57df\u540d<\/code> \u770b\u5ef6\u8fdf<\/li>\n<li>\u8f93\u9519\u4e00\u6b21\u5bc6\u7801\u540e\u7b49\u7279\u522b\u4e45\uff1a\u591a\u5bc6\u94a5\u9010\u4e2a\u5c1d\u8bd5\u53e0\u52a0\u8ba4\u8bc1\u5931\u8d25\uff0c\u7cbe\u7b80 <code>IdentityFile<\/code> \u5217\u8868<\/li>\n<li>\u767b\u5f55\u540e\u7b2c\u4e00\u6761\u547d\u4ee4\u4e5f\u5361\uff1aNFS \u6302\u8f7d\u7684\u4e3b\u76ee\u5f55\u65e0\u54cd\u5e94\u6216\u78c1\u76d8 IO \u9971\u548c\uff0c\u7528 <code>iostat -x 1<\/code> \u4e0e <code>df -h<\/code> \u6838\u5b9e<\/li>\n<\/ul>\n<p>\u8fd9\u5f20\u6e05\u5355\u7684\u4ef7\u503c\u5728\u4e8e\u628a&#8221;\u53d8\u6162&#8221;\u7ffb\u8bd1\u6210&#8221;\u54ea\u4e00\u6bb5\u3001\u54ea\u4e2a\u53c2\u6570&#8221;\uff0c\u907f\u514d\u4e00\u4e0a\u6765\u5c31\u76f2\u76ee\u91cd\u88c5\u7cfb\u7edf\u6216\u91cd\u7f6e\u670d\u52a1\u5668\u3002\u65e5\u5e38\u8fd0\u7ef4\u91cc\uff0c\u5148\u8dd1\u4e00\u6b21\u5e26\u65f6\u95f4\u6233\u7684 <code>ssh -v<\/code>\uff0c\u518d\u6309\u4e0a\u8868\u5bf9\u53f7\u5165\u5ea7\uff0c\u57fa\u672c\u5341\u5206\u949f\u5185\u5c31\u80fd\u51fa\u7ed3\u8bba\u3002\u5982\u679c\u6392\u67e5\u4e2d\u53d1\u73b0\u670d\u52a1\u5668\u672c\u8eab\u8d1f\u8f7d\u957f\u671f\u504f\u9ad8\u3001\u78c1\u76d8 IO \u6301\u7eed\u9971\u548c\uff0c\u90a3\u5c31\u662f\u914d\u7f6e\u4f18\u5316\u89e3\u51b3\u4e0d\u4e86\u7684\u95ee\u9898\uff0c\u8be5\u8003\u8651\u5347\u7ea7\u673a\u5668\u914d\u7f6e\u4e86\u2014\u2014\u76f8\u5173\u601d\u8def\u53ef\u4ee5\u53c2\u8003\u6211\u4eec\u4e4b\u524d\u5199\u7684<a href=\"https:\/\/cn.hostease.com\/blog\/guides\/ttfb-hosting-optimization\/\">\u7f51\u7ad9 TTFB\uff08\u9996\u5b57\u8282\u65f6\u95f4\uff09\u4f18\u5316<\/a>\u4e0e<a href=\"https:\/\/cn.hostease.com\/blog\/server\/\">\u670d\u52a1\u5668\u9009\u578b\u7684\u6587\u7ae0<\/a>\uff0c\u5224\u65ad\u903b\u8f91\u662f\u76f8\u901a\u7684\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/10\/ssh-connection-slow-checklist.webp\" alt=\"SSH \u6392\u67e5\u56db\u8981\u7d20\uff1a\u65e5\u5fd7\u3001\u5bc6\u94a5\u3001\u8d1f\u8f7d\u4e0e\u78c1\u76d8\" loading=\"lazy\" \/><\/p>\n<h2>\u603b\u7ed3\u4e0e\u4e0b\u4e00\u6b65\u5efa\u8bae<\/h2>\n<p>\u56de\u987e\u6574\u4e2a\u6392\u67e5\u8def\u5f84\uff1a\u5148\u7528 <code>ssh -v<\/code> \u628a\u5ef6\u8fdf\u62c6\u5230\u8fde\u63a5\u9636\u6bb5\u6216\u8ba4\u8bc1\u9636\u6bb5\uff1b\u8ba4\u8bc1\u9636\u6bb5\u6700\u5e38\u89c1\u7684\u539f\u56e0\u662f DNS \u53cd\u5411\u89e3\u6790\uff0c\u65e5\u5fd7\u786e\u8ba4\u540e\u7528 <code>UseDNS no<\/code> \u4e00\u884c\u914d\u7f6e\u5173\u95ed\uff1b\u6539\u5b8c\u4ecd\u7136\u6162\uff0c\u518d\u4f9d\u6b21\u6392\u67e5 GSSAPI \u8ba4\u8bc1\u7a7a\u8f6c\u3001\u591a\u5bc6\u94a5\u5c1d\u8bd5\u548c\u78c1\u76d8 IO\u3002\u8fd9\u5957\u65b9\u6cd5\u4e0d\u9700\u8981\u5b89\u88c5\u4efb\u4f55\u989d\u5916\u5de5\u5177\uff0c\u5168\u90e8\u7528\u7cfb\u7edf\u81ea\u5e26\u547d\u4ee4\u5b8c\u6210\u3002<\/p>\n<p>\u5982\u679c\u4f60\u6b63\u5728\u9009\u578b\u6216\u5df2\u7ecf\u4f7f\u7528 Hostease \u7684<a href=\"https:\/\/cn.hostease.com\/dedicated-server\/\">\u72ec\u7acb\u670d\u52a1\u5668<\/a>\u6216 <a href=\"https:\/\/cn.hostease.com\/vps\/\">VPS \u4e3b\u673a<\/a>\uff0c\u6211\u4eec\u5efa\u8bae\u628a\u4e0a\u9762\u8fd9\u4e9b SSH \u914d\u7f6e\u68c0\u67e5\u7eb3\u5165\u65b0\u673a\u5668\u521d\u59cb\u5316\u6e05\u5355\uff0c\u5728\u4e1a\u52a1\u4e0a\u7ebf\u524d\u5c31\u5b8c\u6210 <code>UseDNS<\/code> \u4e0e GSSAPI \u7684\u8bbe\u7f6e\uff0c\u907f\u514d\u4e0a\u7ebf\u540e\u7528\u6237\u767b\u5f55\u4f53\u9a8c\u53d7\u5f71\u54cd\u3002\u90e8\u7f72\u4e2d\u6709\u62ff\u4e0d\u51c6\u7684\u53c2\u6570\uff0c\u4e5f\u53ef\u4ee5\u76f4\u63a5\u8054\u7cfb Hostease \u6280\u672f\u652f\u6301\u534f\u52a9\u6838\u5bf9<a href=\"https:\/\/cn.hostease.com\/blog\/server\/\">\u670d\u52a1\u5668\u914d\u7f6e<\/a>\u3002\u628a\u767b\u5f55\u94fe\u8def\u7684\u6bcf\u4e00\u79d2\u7b49\u5f85\u90fd\u5904\u7406\u5e72\u51c0\uff0c\u662f\u8fd0\u7ef4\u91cc\u6295\u5165\u4ea7\u51fa\u6bd4\u5f88\u9ad8\u7684\u4e00\u4ef6\u5c0f\u4e8b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SSH\u767b\u5f55\u5361\u4f4f\u6570\u5341\u79d2\u624d\u63d0\u793a\u8f93\u5165\u5bc6\u7801\uff1f\u672c\u6587\u6559\u4f60\u4eceDNS\u53cd\u89e3\u3001UseDNS\u53c2\u6570\u548c\u8ba4\u8bc1\u8017\u65f6\u4e09\u4e2a\u65b9\u5411\u5b9a\u4f4d\u670d\u52a1\u5668SSH\u8fde\u63a5\u53d8\u6162\u7684\u539f\u56e0\uff0c\u5e76\u7ed9\u51fa\u53ef\u76f4\u63a5\u6267\u884c\u7684\u6392\u67e5\u547d\u4ee4\u4e0e\u914d\u7f6e\u5efa\u8bae\u3002<\/p>\n","protected":false},"author":2,"featured_media":33835,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3822],"tags":[301,373,5349,3734,5350],"class_list":["post-33839","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guides","tag-dns","tag-ssh","tag-usedns","tag-3734","tag-5350"],"aioseo_notices":[],"jetpack_featured_media_url":"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/10\/ssh-connection-slow-cover.webp","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/posts\/33839","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/comments?post=33839"}],"version-history":[{"count":1,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/posts\/33839\/revisions"}],"predecessor-version":[{"id":34372,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/posts\/33839\/revisions\/34372"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/media\/33835"}],"wp:attachment":[{"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/media?parent=33839"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/categories?post=33839"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/tags?post=33839"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}