我已经使用带有 SSL 证书的 nginx 代理在临时环境和生产环境中成功运行了一个 Spring Boot Web 应用程序几个月了。突然间，昨晚当应用程序尝试发送邮件消息时，当我尝试连接到邮件服务器时，我开始在生产服务器中看到错误。在尝试调试时，我现在完全无法在我们的暂存环境中启动应用程序。这是我在生产中看到的原始错误，现在在暂存中也看到了此错误的一些变化：
2021-05-01 15:00:50,435 ERROR [o.a.c.c.C.[.[.[.[dispatcherServlet]] (http-nio-8088-exec-4) Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.mail.MailSendException: Mail server connection failed; nested exception is javax.mail.MessagingException: Can't send command to SMTP host;
nested exception is:
javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate). Failed messages: javax.mail.MessagingException: Can't send command to SMTP host;
nested exception is:
javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate); message exceptions (1) are:
Failed message 1: javax.mail.MessagingException: Can't send command to SMTP host;
nested exception is:
javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)] with root cause
javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)
at sun.security.ssl.HandshakeContext.<init>(HandshakeContext.java:171)
at sun.security.ssl.ClientHandshakeContext.<init>(ClientHandshakeContext.java:98)
at sun.security.ssl.TransportContext.kickstart(TransportContext.java:220)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:428)
at sun.security.ssl.SSLSocketImpl.ensureNegotiated(SSLSocketImpl.java:804)
at sun.security.ssl.SSLSocketImpl.access$200(SSLSocketImpl.java:73)
at sun.security.ssl.SSLSocketImpl$AppOutputStream.write(SSLSocketImpl.java:1166)
at com.sun.mail.util.TraceOutputStream.write(TraceOutputStream.java:101)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
at com.sun.mail.smtp.SMTPTransport.sendCommand(SMTPTransport.java:1418)
at com.sun.mail.smtp.SMTPTransport.sendCommand(SMTPTransport.java:1408)
该错误表明我的 SSL 协议或密码存在一些问题，但我不知道可能出了什么问题。我的 nginx 配置没有改变，所以现在允许/安全的内容肯定发生了变化。以下是我的配置的相关部分：
ssl_prefer_server_ciphers on;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers "ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS";
我尝试修改密码列表以删除其中的一部分，但没有成功。这不是我非常了解的领域，并且依赖其他一些人来完成设置，但我猜测此配置中的某些内容已过期或过时，从 4 月到 5 月（错误在午夜之后开始）昨晚（格林威治标准时间）。非常感谢任何帮助或建议！
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