Folks,
I'm using Oracle Enterprise Manager (OEM) 12c Cloud Control version 12.1.0.3. It was all working until we rebooted the box.
Now, nothing is listening at port 7801 anymore(per netstat), but if I put port 7302 instead in the browser address bar, it'll actually take me to the OEM login page. Once I'm logged in, many things are showing that there's communication problems between OMS and the agents.
Stopping the processes wasn't very successful/clean, shown below. There were a lot of java processes still running that I had to kill.

| [oracle@{BOX} ~]$$OMS_HOME/bin/emctl stop oms -all -force Oracle Enterprise Manager Cloud Control 12c Release 3 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved. Stopping WebTier... WebTier Could Not Be Stopped Error Occurred: WebTier Could Not Be Stopped Please check /usr/local/app/oracle/product/gc_inst/em/EMGC_OMS1/sysman/log/emctl.log for error details
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Starting it back on looked completely fine, but still we get these problems I mentioned above.
[oracle@{BOX} GCDomain]$$OMS_HOME/bin/emctl start oms
Oracle Enterprise Manager Cloud Control 12c Release 3
Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved.
Starting Oracle Management Server...
Starting WebTier...
WebTier Successfully Started
Oracle Management Server Successfully Started
Oracle Management Server is Up
This seems to be a straightforward issue because we didn't change anything except adding memory to the box and reboot.
Is there anyone experiencing the same issue? Is there any fix to this?
Brian