Welcome to the new Schneider Electric Community

It's your place to connect with experts and peers, get continuous support, and share knowledge.

  • Explore the new navigation for even easier access to your community.
  • Bookmark and use our new, easy-to-remember address (community.se.com).
  • Get ready for more content and an improved experience.

Contact SchneiderCommunity.Support@se.com if you have any questions.

Close
Invite a Co-worker
Send a co-worker an invite to the Exchange portal.Just enter their email address and we’ll connect them to register. After joining, they will belong to the same company.
Send Invite Cancel
84318members
353478posts

DCE and AP7821 Communication Lost

EcoStruxure IT forum

A support forum for Data Center Operation, Data Center Expert, and EcoStruxure IT product users to share knowledge on installation, configuration, and general product use.

DCIM_Support
Picard
Picard
0 Likes
10
280

DCE and AP7821 Communication Lost

This question was originally posted on DCIM Support by Law TJ on 2016-08-09


Hi Team, 

Just want to gather some suggestion for the question as listed above.

Setup:

DCE 7.2.5 polling around 100 device. 

Rack PDU AP7821 was using firmware version v3.7.3 connect through customer network

There are no frequent communication lost from these PDUs before this.

 

Problem description

DCE having lost communication with 4 of the PDU units, and restore itself. The issue repeat on and off many times in a day

 

Action taken:

-reboot rack PDU

-reboot DCE server

-check rack PDU log, no suspicious error found, but having few error like "System: Detected an unauthorized user attempting to access the SNMP interface.."

-able to ping and access Web interface for the PDU.

 

Any ideas?

Thanks,

Law

 

 

(CID:106892297)

10 Replies 10
DCIM_Support
Picard
Picard
0 Likes
2
280

Re: DCE and AP7821 Communication Lost

This answer was originally posted on DCIM Support by Michael Shimmin on 2016-08-09


I would suggest updating the units firmware to the latest revision which is 3.9.2 and can be found at http://www.apc.com/shop/us/en/products/Switched-Metered-Rack-Power-Distribution-Unit-Firmware-Revisi...

(CID:106892300)

DCIM_Support
Picard
Picard
0 Likes
0
280

Re: DCE and AP7821 Communication Lost

This comment was originally posted on DCIM Support by Michael Shimmin on 2016-08-09


I also now noticed your DCE vision is 7.2.5 and the latest is 7.3.1 and you can contact the support group to get the update.

(CID:106892303)

DCIM_Support
Picard
Picard
0 Likes
0
280

Re: DCE and AP7821 Communication Lost

This comment was originally posted on DCIM Support by Law TJ on 2016-08-09


Hi Maybe updating the firmware will be the last resort to solve the problem.. Thanks for the suggestion. Cheers

(CID:106892331)

DCIM_Support
Picard
Picard
0 Likes
1
280

Re: DCE and AP7821 Communication Lost

This answer was originally posted on DCIM Support by Steven Marchetti on 2016-08-09


Hi Law,

 

When the PDU is in this state, are you able to poll it using other SNMP utilities (preferably from the same subnet as DCE)? 

Are you using SNMP version 1 or version 3?

 

You noted the error:

"System: Detected an unauthorized user attempting to access the SNMP interface.."

Does this occur every time the system loses communications? 

The error is usually accompanied by an IP or hostname. If this is not DCE's hostname, can you find that system and stop it from polling the device?

What has changed on the PDU if anything (firmware etc)?

Has anything changed on the DCE server? New discoveries that run often...possibly with different community names?


This k-base may be helpful in troubleshooting SNMP communications issues.


Steve

 

(CID:106892302)

DCIM_Support
Picard
Picard
0 Likes
0
280

Re: DCE and AP7821 Communication Lost

This comment was originally posted on DCIM Support by Law TJ on 2016-08-09


Hi Steve, 1. Didn't try with other snmp polling program or mib browser yet. Will see if it works. 2 There's an ip trying to access, but the retries from this ip is far less than the number of time of lost communication.. Will try to check which device it is. 3. No firmware update has been performed. Will check on the k base suggestions and try out. Thanks

(CID:106892330)

DCIM_Support
Picard
Picard
0 Likes
1
280

Re: DCE and AP7821 Communication Lost

This answer was originally posted on DCIM Support by scordara on 2016-08-09


Hi,

Are the PDU on the same network on DCE ?

Sometime is happen when DCE scan devices across wan due network latency.

You can try adjusting the SNMP Device Scan Setting ( Menu Device > SNMP device communication setting > Devices Scan Settings ) and then increase Timeout and Retries.

Hope it help you resolving the issue.

Regards

Stefano

(CID:106892308)

DCIM_Support
Picard
Picard
0 Likes
0
280

Re: DCE and AP7821 Communication Lost

This comment was originally posted on DCIM Support by Law TJ on 2016-08-09


Hi, Both DCE and pdu are in the same network. I will try on the time out and retries adjustment to check the results. Thanks

(CID:106892329)

DCIM_Support
Picard
Picard
0 Likes
0
280

Re: DCE and AP7821 Communication Lost

This answer was originally posted on DCIM Support by Balaraman Jagadeesan on 2016-08-10


Hi Law, I had similar problem in the past with this PDU model. Upgrading the PDU firmware to the latest firmware resolved the intermittent loss of communication issue. 

Regards,

Bala

(CID:106892345)

DCIM_Support
Picard
Picard
0 Likes
0
280

Re: DCE and AP7821 Communication Lost

This answer was originally posted on DCIM Support by Valentin Kozlov on 2016-08-10


Hi Law!

Did you try to change ports on the switch?

I have similar issue when several devices lost communication due broken switch. We localize the problem by changing ports with other devices and then change switch to resolve problem.

(CID:106892478)

DCIM_Support
Picard
Picard
0 Likes
0
280

🔒 Closed

This question is closed for comments. You're welcome to start a new topic if you have further comments on this issue.