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9:28, EET
November 23, 2015
Offline
Hello,
my OPC-UA-Client creates a Subscription, a couple of MonitoredDataItems and assigns them to buffers. Druring getting the data from server a receive also the following notification e.g. “Invalid sequence number 125 in availableSequenceNumbers list received from server. Current SequenceNumber=124”. I’m getting this information about every five minutes and aslo the current and invalid SequenceNumbers are not the same in each notification.
What does this notification mean and how could I solve this problem
Br,
Usam
13:53, EET
Moderators
April 17, 2013
Offline
Hello,
That logging is intended to indicate that invalid sequence number was detected by the client. The client then deletes this sequence number.
In this scenario this log line should not appear: it’s clear that the SDK is handling message 124 while message 125 (and/or maybe 126) have already arrived to be handled next. The method that produces this log line also contains a check to see whether or not this sequence number corresponds to actual publish response message. This check should prevent this situation and mentioned log line from happening. It’s possible that this is a bug in the SDK.
The consequence in this case is that the sequence number 125 is removed from the client side available sequence numbers. This should only affect the republish service. Your application is probably not influenced by this at all.
and how could I solve this problem
If this is classified as a bug in the SDK, then it will be fixed in the next version of the SDK. In the meantime, you can just ignore that log line. If you really need to get that log line to disappear, you can set logging level of com.prosysopc.ua.client.Subscription package to WARN, ERROR or OFF. However, I would not suggest that as you may miss some important log lines.
Thanks for noticing and reporting this!
12:27, EEST
June 18, 2015
Offline
Hello,
we have a similar issue, but the sequence numbers mentioned in the log-entry are way further apart.
We are using the client Java SDK 2.2.2 and we have the following use case:
The application creates 60+ OPCUA clients, each having exactly 1 subscription with <10 nodes connecting to one commercial OPCUA server.
We see these INFO-level entries in our log:
2016-04-04 11:13:42,701 INFO [PublishTask-….OPCUAClient@1d61f85e][Subscription] – Invalid sequence number 51 in availableSequenceNumbers list received from server. Current SequenceNumber=1
2016-04-04 11:13:42,702 INFO [PublishTask-…..OPCUAClient@2f82fd1][Subscription] – Invalid sequence number 712 in availableSequenceNumbers list received from server. Current SequenceNumber=38
2016-04-04 11:13:42,703 INFO [PublishTask-…..OPCUAClient@208ed0b8][Subscription] – Invalid sequence number 94 in availableSequenceNumbers list received from server. Current SequenceNumber=11
2016-04-04 11:13:42,705 INFO [PublishTask-…..OPCUAClient@4bee1207][Subscription] – Invalid sequence number 772 in availableSequenceNumbers list received from server. Current SequenceNumber=182
2016-04-04 11:13:42,798 INFO [PublishTask-…..OPCUAClient@52020fdd][Subscription] – Invalid sequence number 9454 in availableSequenceNumbers list received from server. Current SequenceNumber=511
Since the numbers in the same log-entry are so unrelated to each other, I assume that it’s a different cause than the above mentioned issue, but maybe they are related.
Is there a way to find out if the issue is with the client or the server?
Thanks in advance!
13:53, EEST
December 21, 2011
Offline
It is a bit difficult to investigate, but sounds like the issue is somehow caused by the server, which is reporting “odd” sequence numbers in the list of available ones.
You could try to enable more logging on the client side, to reveal the details of the communication, so that you could see what the server is sending and what leads to this situation.
In any case, this is not a severe problem. Therefore it is only reported on the INFO level. But it may indicate a problem in the server.
18:09, EEST
June 8, 2016
Offline
We also get this using Simulation Server 2.2.2-1.0.9
1. subscribe / connect while server is down (setKeepSubscriptions() was not called – don’t know what the default is)
2. shut down server: several “Invalid sequence number” messages from client
3. start up server: even more “Invalid sequence number” messages from client
Not sure if even a simpler setup would also cause this.
14:13, EEST
Moderators
April 17, 2013
Offline
Hello,
This is a known bug at the moment. This is not related to Simulation Server, it’s a client side issue in the SDK and happens with all servers.
In above situation 2. this can be seen in logging statements like this:
In above situation 3. this can be seen in logging statements like this:
This is an unfortunate situation, but luckily this should not cause too much trouble for you. This should only affect the republish service and your application is probably not influenced by this at all. If you believe that you have an application scenario where this causes problems and you would like to have an instant fix, then please contact us at uajava-support@prosysopc.com. Otherwise you can just wait for the next SDK release where this should be fixed.
18:15, EEST
June 8, 2016
Offline
We have an up-to-date case. The problem it causes is that log is spammed (46913 messages is roughly 80 minutes) and that we are unsure whether we are “in sync” with our subscriptions. I’ll get in touch with you directly…
This is a log excerpt (Server was restarted)
2016-09-30 14:55:04,488 WARN io.SecureChannelTcp:? Connection failed: Bad_ConnectionRejected (code=0x80AC0000, description=”2158755840, Connection refused: connect”)
2016-09-30 14:55:05,504 ERROR *disclosed*Bad_ConnectionRejected (code=0x80AC0000, description=”2158755840, Connection refused: connect”)
caused by:
Bad_ConnectionRejected (code=0x80AC0000, description=”2158755840, Connection refused: connect”)
caused by:
Connection refused: connect
2016-09-30 14:55:33,518 INFO client.UaClient:? Server sent a certificate, although SecurityPolicy NONE is used
2016-09-30 14:55:33,525 INFO client.Subscription:? Invalid sequence number 7667 in availableSequenceNumbers list received from server. Current SequenceNumber=0
2016-09-30 14:55:33,526 INFO *disclosed* ServerState: CommunicationFault ==> Running
2016-09-30 14:55:39,450 INFO client.Subscription:? Invalid sequence number 7667 in availableSequenceNumbers list received from server. Current SequenceNumber=0
2016-09-30 14:55:39,577 INFO client.Subscription:? Invalid sequence number 7667 in availableSequenceNumbers list received from server. Current SequenceNumber=1
…
…
2016-09-30 16:12:16,116 INFO client.Subscription:? Invalid sequence number 7667 in availableSequenceNumbers list received from server. Current SequenceNumber=534
2016-09-30 16:12:16,217 INFO client.Subscription:? Invalid sequence number 7667 in availableSequenceNumbers list received from server. Current SequenceNumber=534
2016-09-30 16:12:16,317 INFO client.Subscription:? Invalid sequence number 7667 in availableSequenceNumbers list received from server. Current SequenceNumber=534
2016-09-30 16:12:16,418 INFO client.Subscription:? Invalid sequence number 7667 in availableSequenceNumbers list received from server. Current SequenceNumber=534
2016-09-30 16:12:16,518 INFO client.Subscription:? Invalid sequence number 7667 in availableSequenceNumbers list received from server. Current SequenceNumber=534
2016-09-30 16:12:16,618 INFO client.Subscription:? Invalid sequence number 7667 in availableSequenceNumbers list received from server. Current SequenceNumber=534
14:58, EEST
March 10, 2016
Offline
We are also running into this problem with the Client-Binary-2.2.2-638. The log files are getting spammed with this error multiple times per second:
10/26/2016 09:53:50.626 INFO [t@6579132e] bscription – Invalid sequence number 5133 in availableSequenceNumbers list received from server. Current SequenceNumber=4526
10/26/2016 09:53:50.726 INFO [t@6579132e] bscription – Invalid sequence number 4643 in availableSequenceNumbers list received from server. Current SequenceNumber=4526
10/26/2016 09:53:50.726 INFO [t@6579132e] bscription – Invalid sequence number 4644 in availableSequenceNumbers list received from server. Current SequenceNumber=4526
10/26/2016 09:53:50.726 INFO [t@6579132e] bscription – Invalid sequence number 5133 in availableSequenceNumbers list received from server. Current SequenceNumber=4526
10/26/2016 09:53:50.826 INFO [t@6579132e] bscription – Invalid sequence number 4643 in availableSequenceNumbers list received from server. Current SequenceNumber=4526
10/26/2016 09:53:50.826 INFO [t@6579132e] bscription – Invalid sequence number 4644 in availableSequenceNumbers list received from server. Current SequenceNumber=4526
10/26/2016 09:53:50.826 INFO [t@6579132e] bscription – Invalid sequence number 5133 in availableSequenceNumbers list received from server. Current SequenceNumber=4526
10/26/2016 09:53:50.926 INFO [t@6579132e] bscription – Invalid sequence number 4643 in availableSequenceNumbers list received from server. Current SequenceNumber=4526
10/26/2016 09:53:50.926 INFO [t@6579132e] bscription – Invalid sequence number 4644 in availableSequenceNumbers list received from server. Current SequenceNumber=4526
10/26/2016 09:53:50.926 INFO [t@6579132e] bscription – Invalid sequence number 5133 in availableSequenceNumbers list received from server. Current SequenceNumber=4526
10/26/2016 09:53:51.026 INFO [t@6579132e] bscription – Invalid sequence number 4643 in availableSequenceNumbers list received from server. Current SequenceNumber=4526
10/26/2016 09:53:51.026 INFO [t@6579132e] bscription – Invalid sequence number 4644 in availableSequenceNumbers list received from server. Current SequenceNumber=4526
I’m going to try updating to 2.2.4 to see if this is any better, but at this rate I’ll have to turn off subscription error logging.
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