Hello,

The client connection will close and then after reconnecting will report a “Sequence number mismatch”. Following this the client will continue to connect then disconnect every second or so. What steps can be taken to fix this problem?

[2017-02-02 15:42:23,366] [PublishTask-com.prosysopc.ua.client.UaClient@5c18016b] INFO — : OpcMonitoredDataItemListener – Data item opc.tcp://10.50.10.10:53530/ns=2;s=test.T1.TakeOff1 changed to: 16323
[2017-02-02 15:42:25,359] [TcpConnection/Read] INFO — : TcpConnection – /10.50.10.10:53530 Closed (graceful)
[2017-02-02 15:42:25,359] [TcpConnection/Read] INFO — : TcpConnection – /10.50.10.10:53530 Closed
[2017-02-02 15:42:25,359] [TcpConnection/Read] INFO — : SecureChannelTcp – 1766099742: Error recovery = true
[2017-02-02 15:42:25,360] [Blocking-Work-Executor-4] INFO — : TcpConnection – /10.50.10.10:53530 Connecting
[2017-02-02 15:42:25,561] [Blocking-Work-Executor-4] INFO — : TcpConnection – /10.50.10.10:53530 Connected
[2017-02-02 15:42:25,563] [TcpConnection/Read] WARN — : TcpConnection – /10.50.10.10:53530 Sequence number mismatch: 255 vs. 257
[2017-02-02 15:42:25,564] [TcpConnection/Read] INFO — : TcpConnection – /10.50.10.10:53530 Closed
[2017-02-02 15:42:25,564] [Blocking-Work-Executor-6] WARN — : UaClient$a – onError:
org.opcfoundation.ua.common.ServiceResultException: Bad_UnexpectedError (code=0x80010000, description=”Sequence number mismatch”)
at org.opcfoundation.ua.transport.tcp.io.TcpConnection$ReadThread.run(Unknown Source)
[2017-02-02 15:42:25,565] [Blocking-Work-Executor-5] WARN — : UaClient$a – onError:
org.opcfoundation.ua.common.ServiceResultException: Bad_UnexpectedError (code=0x80010000, description=”Sequence number mismatch”)
at org.opcfoundation.ua.transport.tcp.io.TcpConnection$ReadThread.run(Unknown Source)
[2017-02-02 15:42:25,566] [Blocking-Work-Executor-7] WARN — : UaClient$a – onError:
org.opcfoundation.ua.common.ServiceResultException: Bad_UnexpectedError (code=0x80010000, description=”Sequence number mismatch”)
at org.opcfoundation.ua.transport.tcp.io.TcpConnection$ReadThread.run(Unknown Source)
[2017-02-02 15:42:25,566] [TcpConnection/Read] INFO — : SecureChannelTcp – 1766099742: Error recovery = false
[2017-02-02 15:42:25,882] [PublishTask-com.prosysopc.ua.client.UaClient@5c18016b] INFO — : OpcServerStatusListener – Server state changed from Running to CommunicationFault
[2017-02-02 15:42:25,882] [PublishTask-com.prosysopc.ua.client.UaClient@5c18016b] ERROR — : OpcServerStatusListener – Communication Fault server state
[2017-02-02 15:42:25,985] [PublishTask-com.prosysopc.ua.client.UaClient@5c18016b] INFO — : SecureChannelTcp – 1766099742 Closed
[2017-02-02 15:42:25,986] [PublishTask-com.prosysopc.ua.client.UaClient@5c18016b] INFO — : TcpConnection – /10.50.10.10:53530 Connecting
[2017-02-02 15:42:26,189] [PublishTask-com.prosysopc.ua.client.UaClient@5c18016b] INFO — : TcpConnection – /10.50.10.10:53530 Connected
[2017-02-02 15:42:26,201] [PublishTask-com.prosysopc.ua.client.UaClient@5c18016b] INFO — : Subscription – Requesting missing NotificationMessage (SequenceNumber=371) from the server using Republish: Target SequenceNumber=371
[2017-02-02 15:42:26,202] [PublishTask-com.prosysopc.ua.client.UaClient@5c18016b] INFO — : Subscription – Message not available
[2017-02-02 15:42:26,202] [PublishTask-com.prosysopc.ua.client.UaClient@5c18016b] INFO — : UaClient – reconnect: Reconnected to server (session reactivated)
[2017-02-02 15:42:26,203] [PublishTask-com.prosysopc.ua.client.UaClient@5c18016b] INFO — : OpcServerStatusListener – Server state changed from CommunicationFault to Running
[2017-02-02 15:42:49,368] [PublishTask-com.prosysopc.ua.client.UaClient@5c18016b] INFO — : OpcSubscriptionAliveListener – Thu Feb 02 15:42:49 UTC 2017 Subscription timeout: ID=2 lastAlive=Thu Feb 02 15:42:23 UTC 2017