如果你重启了OMS的服务器，那么系统启动好了以后，可能OMS的WEB Portal依旧不可用。
因为OMS的服务，开机并不自动启动。
这时候，你就需要手动操作了。
具体如下：
查看服务状态：
[oracle@oms13c middleware]$ ./bin/emctl status dbconsole OC4J Configuration issue. /u01/app/oracle/product/13c/middleware/oc4j/j2ee/OC4J_DBConsole not found. [oracle@oms13c middleware]$ ./bin/emctl status oms Oracle Enterprise Manager Cloud Control 13c Release 2 Copyright (c) 1996, 2016 Oracle Corporation. All rights reserved. WebTier is Down Oracle Management Server is Down JVMD Engine is Down BI Publisher Server is Down BI Publisher is disabled, to enable BI Publisher on this host, use the 'emctl config oms -enable_bip' command [oracle@oms13c middleware]$
启动OMS服务：
[oracle@oms13c middleware]$ ./bin/emctl start oms Oracle Enterprise Manager Cloud Control 13c Release 2 Copyright (c) 1996, 2016 Oracle Corporation. All rights reserved. Starting Oracle Management Server... WebTier Successfully Started Oracle Management Server Already Started Oracle Management Server is Up JVMD Engine is Up [oracle@oms13c middleware]$
启动好了以后，你可以去查看系统的端口占用情况：
[root@oms13c ~]# netstat -tupln | grep java tcp 0 0 ::ffff:10.158.1.116:7102 :::* LISTEN 3486/java tcp 0 0 :::3872 :::* LISTEN 2670/java tcp 0 0 ::ffff:10.158.1.116:7301 :::* LISTEN 6943/java tcp 0 0 ::ffff:10.158.1.116:7403 :::* LISTEN 2781/java udp 0 0 :::3872 :::* 2670/java [root@oms13c ~]# OMS安装好了以后，端口的信息存放在这里：
[oracle@oms13c ~]$ cat /u01/app/oracle/product/13c/middleware/install/portlist.ini Enterprise Manager Upload Http Port=4889 Enterprise Manager Upload Http SSL Port=4903 OHS Http Port=9788 BI Publisher Http Port=9701 Enterprise Manager Central Console Http SSL Port=7802 Node Manager Http SSL Port=7403 BI Publisher Http SSL Port=9803 OHS Http SSL Port=9851 Managed Server Http Port=7202 Oracle Management Agent Port=3872 Enterprise Manager Central Console Http Port=7788 Admin Server Http SSL Port=7102 Managed Server Http SSL Port=7301 [oracle@oms13c ~]$
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Done。