SNMP requests changed to UNSUPPORTED

[rainerh]

Hello and thank you for the very much to have NetXMS.

I have a strange problem.
I watch my LENOVO Servers X3650 by SNMP
All the same servers, about 10, only some did not work fine.
Normaly all my Values are "green" and ok and all the communication with my servers is ok.
But sometimes (regulary) I get the message, that "SNMP requests changed to UNSUPPORTED" and all my Values get red!
Then it appears like the server has a failure.
And after a while all is working fine.
I am connected to my servers by VPN, but most os the work fine withoit these problem.
I have 2 servers in the same network as NetXMS Server and both have the described problem.

When I poll status, every thing is ok an returns for axample "Interface status retrieved from SNMP agent"
When I poll configuration the answer is ok "SNMP agent is active (version 3)"

Thank you for helping
Rainer

[rainerh]

My be that I found a reason for these problem.
In Instance Discovery I only used
"snmp = CreateSNMPTransport($node);"
And did not check of transport is ok.
Now I added these lines

snmp = CreateSNMPTransport($node);
if (snmp == null) {
  return null;
}

Di you think that the problem can be of the missin check if (snmp == null)?

Thank you
Rainer

[rainerh]

oh no - this was not the reasen
The same Problem again

[rainerh]

The Alarm looks like this:

Most of the time every thing looks good and fine:

The Values change to ERROR like this:

It goes up and down all the time.

--> The device (Lenovo host) definitely supports the OID
--> In my opinion it can be due to the following:
  - the device is currently unreachable but NetXMS hasn't worked that out yet
  - the device is having a temporary issue dealing with the request

Is there a possibility if there is a temporary problem with the communication, that NetXMS will wait until the communication is stabable?
Or that NetXMS tests the result for 3 or 5 times (polling(???) and take the only one which will work fine.

I hope anyone could help me.

Thank you so much
Rainer