Re: OEM reporting listener down but listener not actually down

Hang on, I am confused now.

I thought that the agent on the database host reports the status of the listener to OMS. So I read this as the agent on database host could not connect to listener on database host.
Are you saying that we can get this because the OMS server can not connect to the listener?

Jack van Zanen

> Hi Jack,
>
> That can also be a problem with DNS or a network route. If the host
> hosting the OEM cannot reach listener for whatever reason, you will get
> this error. It can be something as trivial as a bad port on the switch or
> change in DNS server.
>
> Regards
> On 12/1/19 7:19 PM, Jack van Zanen wrote:
>
> intermittently we get some alert from OEM about listener being down.
>
> Target name=*LISTENER_SCAN3_telstraexa1-000_1*
> <https://aus01.safelinks.protection.outlook.com/?url=https%3A%2F%2FNSW-ATP-GRID.snl.7net.com.au%3A7799%2Fem%2Fredirect%3FpageType%3DTARGET_HOMEPAGE%26targetName%3DLISTENER_SCAN3_telstraexa1-000_1%26targetType%3Doracle_listener&data=01%7C01%7CJVanZanen%40Seven.com.au%7C5514208b3d2848d8fe9f08d774d613ee%7Cb359291241554399b790752c894d2935%7C0&sdata=Pww2ktObyuQu4vBRxuWvcmAGkXXJIozv%2F8nHJP1ABHE%3D&reserved=0>
> Categories=*Availability*
> Message=*The listener is down: TNS-12545: Connect failed because target
> host or object does not exist .*
> <https://aus01.safelinks.protection.outlook.com/?url=https%3A%2F%2FNSW-ATP-GRID.snl.7net.com.au%3A7799%2Fem%2Fredirect%3FpageType%3Dsdk-core-event-console-detailEvent%26issueID%3DE43696ECA26F42148CCCD6EC4862F4A9&data=01%7C01%7CJVanZanen%40Seven.com.au%7C5514208b3d2848d8fe9f08d774d613ee%7Cb359291241554399b790752c894d2935%7C0&sdata=z%2FQDPTS5qbEkx1MB8kdz3JKvyYGToJ4%2BUbcptqfRc7I%3D&reserved=0>
>
>
> Checking the server we see no issue with the listener being down.
>
>
> grid 24040 1 0 Nov23 ? 00:03:48 /u01/app/
> 12.2.0.1/grid/bin/tnslsnr ASMNET1LSNR_ASM -no_crs_notify -inherit
> grid 24402 1 0 Nov23 ? 00:04:58 /u01/app/
> 12.2.0.1/grid/bin/tnslsnr LISTENER -no_crs_notify -inherit
> grid 234773 1 0 Nov23 ? 00:02:16 /u01/app/
> 12.2.0.1/grid/bin/tnslsnr LISTENER_SCAN2 -no_crs_notify -inherit
> grid 234791 1 0 Nov23 ? 00:02:13 /u01/app/
> 12.2.0.1/grid/bin/tnslsnr LISTENER_SCAN3 -no_crs_notify -inherit
>
>
> This is Oracle 12.2 on Exadata Cloud at Customer solution . Anyone else
> seen this behaviour before?
>
> Oracle suggested to turn on client and server sql net tracing but I am a
> bit hesitant due to the sheer volume of tracing it will likely generate
> before I get the issue again.
>
> To me it looks like a DNS issue, but Oracle looked at this and there is no
> issues there.
>
>
>
>
> Jack van Zanen
>
>
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