451 4.7.0 Temporary server error. Please try again later. PRX2 故障处理

标签：smtp error   451 4.7.0   temporary server error   exchange 2013   cu2   

本周四临近下班时，接到一个客户的电话——其Exchange 2013 CU2系统终端用户无法使用 SMTP 方式发送邮件。当客户端（OLK或者Foxmail）发送邮件时，系统提示错误：

451 4.7.0 Temporary server error. Please try again later. PRX2

诊断时，通过telnet Server 25命令检测可以连接；通过客户端软件连接时，身份验证操作成功。同时，在故障期间伴随着无法使用POP3收取邮件。

毋庸置疑地，Exchange 2013服务器端服务均正常运行。

通过打开前端连接器的“详细日志”，检查后发现了问题的根源所在：DNS查询失败。参见下面红褐色部分文字。

2014-05-22T04:23:36.138Z,CAS-BJ-02\SMTP,08D14140A7CA0122,23,192.168.0.7:25,192.168.0.5:64375,>,451 4.7.0 Temporary server error. Please try again later. PRX2 ,
2014-05-22T04:23:36.170Z,CAS-BJ-02\SMTP,08D14140A7CA0122,24,192.168.0.7:25,192.168.0.5:64375,-,,Remote(SocketError)
2014-05-22T04:25:01.141Z,CAS-BJ-02\SMTP,08D14140A7CA0124,0,192.168.0.7:25,192.168.0.5:62597,+,,
2014-05-22T04:25:01.141Z,CAS-BJ-02\SMTP,08D14140A7CA0124,1,192.168.0.7:25,192.168.0.5:62597,*,SMTPSubmit SMTPAcceptAnySender SMTPAcceptAuthoritativeDomainSender AcceptRoutingHeaders,Set Session Permissions
2014-05-22T04:25:01.141Z,CAS-BJ-02\SMTP,08D14140A7CA0124,2,192.168.0.7:25,192.168.0.5:62597,>,"220 mail.alexchen.info Microsoft ESMTP MAIL Service ready at Thu, 22 May 2014 12:25:00 +0800",
2014-05-22T04:25:01.235Z,CAS-BJ-02\SMTP,08D14140A7CA0124,3,192.168.0.7:25,192.168.0.5:62597,<,EHLO ozkzitc.mobi,
2014-05-22T04:25:01.235Z,CAS-BJ-02\SMTP,08D14140A7CA0124,4,192.168.0.7:25,192.168.0.5:62597,>,250-mail.alexchen.info Hello [192.168.0.5],
2014-05-22T04:25:01.235Z,CAS-BJ-02\SMTP,08D14140A7CA0124,5,192.168.0.7:25,192.168.0.5:62597,>,250-SIZE 524288000,
2014-05-22T04:25:01.235Z,CAS-BJ-02\SMTP,08D14140A7CA0124,6,192.168.0.7:25,192.168.0.5:62597,>,250-PIPELINING,
2014-05-22T04:25:01.235Z,CAS-BJ-02\SMTP,08D14140A7CA0124,7,192.168.0.7:25,192.168.0.5:62597,>,250-DSN,
2014-05-22T04:25:01.235Z,CAS-BJ-02\SMTP,08D14140A7CA0124,8,192.168.0.7:25,192.168.0.5:62597,>,250-ENHANCEDSTATUSCODES,
2014-05-22T04:25:01.235Z,CAS-BJ-02\SMTP,08D14140A7CA0124,9,192.168.0.7:25,192.168.0.5:62597,>,250-STARTTLS,
2014-05-22T04:25:01.235Z,CAS-BJ-02\SMTP,08D14140A7CA0124,10,192.168.0.7:25,192.168.0.5:62597,>,250-AUTH LOGIN,
2014-05-22T04:25:01.235Z,CAS-BJ-02\SMTP,08D14140A7CA0124,11,192.168.0.7:25,192.168.0.5:62597,>,250-8BITMIME,
2014-05-22T04:25:01.235Z,CAS-BJ-02\SMTP,08D14140A7CA0124,12,192.168.0.7:25,192.168.0.5:62597,>,250-BINARYMIME,
2014-05-22T04:25:01.235Z,CAS-BJ-02\SMTP,08D14140A7CA0124,13,192.168.0.7:25,192.168.0.5:62597,>,250 CHUNKING,
2014-05-22T04:25:01.266Z,CAS-BJ-02\SMTP,08D14140A7CA0124,14,192.168.0.7:25,192.168.0.5:62597,<,MAIL FROM: <xxx@ozkzitc.mobi>,
2014-05-22T04:25:01.266Z,CAS-BJ-02\SMTP,08D14140A7CA0124,15,192.168.0.7:25,192.168.0.5:62597,*,08D14140A7CA0124;2014-05-22T04:25:01.141Z;1,receiving message
2014-05-22T04:25:01.266Z,CAS-BJ-02\SMTP,08D14140A7CA0124,16,192.168.0.7:25,192.168.0.5:62597,>,250 2.1.0 Sender OK,
2014-05-22T04:25:01.313Z,CAS-BJ-02\SMTP,08D14140A7CA0124,17,192.168.0.7:25,192.168.0.5:62597,<,RCPT TO: <shl@alexchen.info>,
2014-05-22T04:25:01.313Z,CAS-BJ-02\SMTP,08D14140A7CA0124,18,192.168.0.7:25,192.168.0.5:62597,>,250 2.1.5 Recipient OK,
2014-05-22T04:25:01.360Z,CAS-BJ-02\SMTP,08D14140A7CA0124,19,192.168.0.7:25,192.168.0.5:62597,<,DATA,
2014-05-22T04:25:01.360Z,CAS-BJ-02\SMTP,08D14140A7CA0124,20,192.168.0.7:25,192.168.0.5:62597,>,354 Start mail input; end with <CRLF>.<CRLF>,
2014-05-22T04:25:01.407Z,CAS-BJ-02\SMTP,08D14140A7CA0124,21,192.168.0.7:25,192.168.0.5:62597,*,,Proxy destination(s) obtained from OnProxyInboundMessage event
2014-05-22T04:25:01.407Z,CAS-BJ-02\SMTP,08D14140A7CA0124,22,192.168.0.7:25,192.168.0.5:62597,*,,Message or connection acked with status Retry and response 451 4.4.0 DNS query failed. The error was: SMTPSEND.DNS.NonExistentDomain; nonexistent domain

进一步检查前端服务器的连接日志。显然地，使用了公网DNS服务器114.114.114.114来解析内部主机的名称。

2014-05-22T04:25:01.407Z,08D14140A7CA0125,SMTP,internalproxy,+,Undefined 00000000-0000-0000-0000-000000000000;QueueLength=<no priority counts>
2014-05-22T04:25:01.407Z,08D14140A7CA0125,SMTP,internalproxy,>,Non-existent domain reported by 114.114.114.114. [Domain:Result] = MBX-BJ-02.alexchen.info:InfoDomainNonexistent; MBX-BJ-03.alexchen.info:InfoDomainNonexistent; MBX-BJ-01.alexchen.info:InfoDomainNonexistent;
2014-05-22T04:25:01.407Z,08D14140A7CA0125,SMTP,internalproxy,-,Messages: 0 Bytes: 0 (The DNS query for  ‘Undefined‘:‘internalproxy‘:‘00000000-0000-0000-0000-000000000000‘ failed with error : InfoDomainNonexistent)

在前端服务器的主DNS服务器指向了内部的DC集成的DNS服务器，辅助DNS服务器配置参数指向114.114.114.114。依据上述的日志输出信息判断，显然是首DNS服务器失效，服务器才会继而使用辅助DNS服务器执行查询。但是，使用NSLookup命令查询上述日志中出现的主机时，得到正确的查询结果。

至此，排错目标转向内部DNS服务器。

首先的操作是重启DNS服务器。服务重启之后，意外出现了，在正向查找区域中 alexchen.info 的DNS Zone不见了，值剩下 _msdcs zone。

其次，重建DNS zone，使用DNS记录的文本备份。

最后，确认DNS回复正常之后，重启前后端Exchange的传输服务。故障消失。

本文出自 “Alex无聊闲语之处” 博客，请务必保留此出处http://alexcqchen.blog.51cto.com/7192908/1416664

451 4.7.0 Temporary server error. Please try again later. PRX2 故障处理,布布扣,bubuko.com

451 4.7.0 Temporary server error. Please try again later. PRX2 故障处理

标签：smtp error   451 4.7.0   temporary server error   exchange 2013   cu2   

原文地址：http://alexcqchen.blog.51cto.com/7192908/1416664