I've been receiving this kind of notice alarms (nothing critical) but would be good to know why the system is generating them, could be an issue with the users?
I already tried to sync the security file on all the DMAs in the cluster but the alarms still showing.
This is the complete alarm:
Unexpected Exception [Exception from HRESULT: 0x8004028A]: The client is unknown.
(Element Subscription) (
Server stack trace:
at Interop.SLDataMiner.IDataMiner.NotifyDataMiner(String bstrUser, Int32 iType, Object varValue, Object varValue2, Object& pvarReturnValue)
at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)
Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at Interop.SLDataMiner.IDataMiner.NotifyDataMiner(String bstrUser, Int32 iType, Object varValue, Object varValue2, Object& pvarReturnValue)
at Skyline.DataMiner.Net.DataMiner.SubscribeOnSLDataMinerElementInner(SubscribeInfo info))
Any idea on how to tackle this issue?
Hi Jaime, this error typically means the user session-id that came in with a call has been removed or is not yet available on the DataMiner node. More information could probably be found in the SLNet logs around that time.
![](https://community.dataminer.services/wp-content/uploads/wp-user-manager-uploads/2023/01/IMG_0213.jpeg)
Hey Jan
Thanks for your answer, I’ll check in the user system to identify in the SLNet log something odd around the time of the notice alarm, so if I understood correctly should be something related to a missing user right?