# Node OPC-UA does not work **URL:** \ **Category:** Ignition\ **Created:** [May 8, 2018, 7:26am UTC](https://forum.inductiveautomation.com/t/node-opc-ua-does-not-work/17953 "2018-05-08T07:26:19Z")\ **Posts on this page:** 15\ **Page:** 1
**Author:** ![smateos](https://avatars.discourse-cdn.com/v4/letter/s/a698b9/32.png) [@smateos](https://forum.inductiveautomation.com/u/smateos)\ **Post date:** [May 8, 2018, 7:26am UTC](https://forum.inductiveautomation.com/t/node-opc-ua-does-not-work/17953/1 "2018-05-08T07:26:19Z")
Hello, I have been developing a OPC-UA server for 2 months and worked fine with UA expert and some other clients but now i have a problem with Ignition. I can read all the variables names and folders on the server but the value is always null and the status is stale. In the ignition log it says this > org.eclipse.milo.opcua.stack.core.UaSerializationException: max array length exceeded (length=66003, max=65535) I can't find any option to configure this and i am not trying to read an array. Thanks for any help that you could provide, i have been trying to solve this for a couple of days but i couldn find anything. ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [May 8, 2018, 12:05pm UTC](https://forum.inductiveautomation.com/t/node-opc-ua-does-not-work/17953/2 "2018-05-08T12:05:10Z")
What version of Ignition are you using? Can you get a Wireshark capture of the OPC UA traffic between Ignition and your server? ---
**Author:** ![smateos](https://avatars.discourse-cdn.com/v4/letter/s/a698b9/32.png) [@smateos](https://forum.inductiveautomation.com/u/smateos)\ **Post date:** [May 8, 2018, 1:33pm UTC](https://forum.inductiveautomation.com/t/node-opc-ua-does-not-work/17953/3 "2018-05-08T13:33:08Z")
I am using Ignition 7.9.7, these are the traffic request and response traces: ```auto Frame 550: 139 bytes on wire (1112 bits), 139 bytes captured (1112 bits) on interface 0 Interface id: 0 (enp0s25) Encapsulation type: Ethernet (1) Arrival Time: May 8, 2018 13:53:06.875031796 CEST [Time shift for this packet: 0.000000000 seconds] Epoch Time: 1525780386.875031796 seconds [Time delta from previous captured frame: 0.031982288 seconds] [Time delta from previous displayed frame: 2.212671434 seconds] [Time since reference or first frame: 18.853481575 seconds] Frame Number: 550 Frame Length: 139 bytes (1112 bits) Capture Length: 139 bytes (1112 bits) [Frame is marked: False] [Frame is ignored: False] [Protocols in frame: eth:ethertype:ip:tcp:opcua] [Coloring Rule Name: TCP] [Coloring Rule String: tcp] Ethernet II, Src: HewlettP_48:c6:07 (e4:11:5b:48:c6:07), Dst: 18:60:24:4a:be:eb (18:60:24:4a:be:eb) Destination: 18:60:24:4a:be:eb (18:60:24:4a:be:eb) Address: 18:60:24:4a:be:eb (18:60:24:4a:be:eb) .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) Source: HewlettP_48:c6:07 (e4:11:5b:48:c6:07) Address: HewlettP_48:c6:07 (e4:11:5b:48:c6:07) .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) Type: IPv4 (0x0800) Internet Protocol Version 4, Src: 192.168.20.12, Dst: 192.168.20.11 0100 .... = Version: 4 .... 0101 = Header Length: 20 bytes (5) Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT) 0000 00.. = Differentiated Services Codepoint: Default (0) .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0) Total Length: 125 Identification: 0x89d7 (35287) Flags: 0x02 (Don't Fragment) 0... .... = Reserved bit: Not set .1.. .... = Don't fragment: Set ..0. .... = More fragments: Not set Fragment offset: 0 Time to live: 64 Protocol: TCP (6) Header checksum: 0x073c [validation disabled] [Header checksum status: Unverified] Source: 192.168.20.12 Destination: 192.168.20.11 [Source GeoIP: Unknown] [Destination GeoIP: Unknown] Transmission Control Protocol, Src Port: 4334, Dst Port: 34678, Seq: 900, Ack: 1023, Len: 85 Source Port: 4334 Destination Port: 34678 [Stream index: 2] [TCP Segment Len: 85] Sequence number: 900 (relative sequence number) [Next sequence number: 985 (relative sequence number)] Acknowledgment number: 1023 (relative ack number) Header Length: 20 bytes Frame 335: 166 bytes on wire (1328 bits), 166 bytes captured (1328 bits) on interface 0 Interface id: 0 (enp0s25) Encapsulation type: Ethernet (1) Arrival Time: May 8, 2018 15:30:51.107493138 CEST [Time shift for this packet: 0.000000000 seconds] Epoch Time: 1525786251.107493138 seconds [Time delta from previous captured frame: 0.032023682 seconds] [Time delta from previous displayed frame: 2.095155030 seconds] [Time since reference or first frame: 14.151176241 seconds] Frame Number: 335 Frame Length: 166 bytes (1328 bits) Capture Length: 166 bytes (1328 bits) [Frame is marked: False] [Frame is ignored: False] [Protocols in frame: eth:ethertype:ip:tcp:opcua] [Coloring Rule Name: TCP] [Coloring Rule String: tcp] Ethernet II, Src: 18:60:24:4a:be:eb (18:60:24:4a:be:eb), Dst: HewlettP_48:c6:07 (e4:11:5b:48:c6:07) Destination: HewlettP_48:c6:07 (e4:11:5b:48:c6:07) Address: HewlettP_48:c6:07 (e4:11:5b:48:c6:07) .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) Source: 18:60:24:4a:be:eb (18:60:24:4a:be:eb) Address: 18:60:24:4a:be:eb (18:60:24:4a:be:eb) .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) Type: IPv4 (0x0800) Internet Protocol Version 4, Src: 192.168.20.11, Dst: 192.168.20.12 0100 .... = Version: 4 .... 0101 = Header Length: 20 bytes (5) Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT) 0000 00.. = Differentiated Services Codepoint: Default (0) .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0) Total Length: 152 Identification: 0x0189 (393) Flags: 0x02 (Don't Fragment) 0... .... = Reserved bit: Not set .1.. .... = Don't fragment: Set ..0. .... = More fragments: Not set Fragment offset: 0 Time to live: 128 Protocol: TCP (6) Header checksum: 0x4f6f [validation disabled] [Header checksum status: Unverified] Source: 192.168.20.11 Destination: 192.168.20.12 [Source GeoIP: Unknown] [Destination GeoIP: Unknown] Transmission Control Protocol, Src Port: 34907, Dst Port: 4334, Seq: 225, Ack: 161, Len: 112 Source Port: 34907 Destination Port: 4334 [Stream index: 4] [TCP Segment Len: 112] Sequence number: 225 (relative sequence number) [Next sequence number: 337 (relative sequence number)] Acknowledgment number: 161 (relative ack number) Header Length: 20 bytes Flags: 0x018 (PSH, ACK) 000. .... .... = Reserved: Not set ...0 .... .... = Nonce: Not set .... 0... .... = Congestion Window Reduced (CWR): Not set .... .0.. .... = ECN-Echo: Not set .... ..0. .... = Urgent: Not set .... ...1 .... = Acknowledgment: Set .... .... 1... = Push: Set .... .... .0.. = Reset: Not set .... .... ..0. = Syn: Not set .... .... ...0 = Fin: Not set [TCP Flags: ·······AP···] Window size value: 2052 [Calculated window size: 2052] [Window size scaling factor: -1 (unknown)] Checksum: 0xf768 [unverified] [Checksum Status: Unverified] Urgent pointer: 0 [SEQ/ACK analysis] [Bytes in flight: 112] [Bytes sent since last PSH flag: 112] [PDU Size: 112] OpcUa Binary Protocol Message Type: MSG Chunk Type: F Message Size: 112 SecureChannelId: 2 Security Token Id: 13 Security Sequence Number: 1157 Security RequestId: 1157 OpcUa Service : Encodeable Object TypeId : ExpandedNodeId NodeId EncodingMask: Four byte encoded Numeric (0x01) NodeId Namespace Index: 0 NodeId Identifier Numeric: ReadRequest (631) ReadRequest RequestHeader: RequestHeader AuthenticationToken: NodeId .... 0101 = EncodingMask: Opaque (0x5) Namespace Index: 0 Identifier ByteString: 42d7b67d0dfa2b5a7000703f7f16665f Timestamp: May 8, 2018 15:30:39.519000000 CEST RequestHandle: 2677 Return Diagnostics: 0x00000000 .... .... .... ...0 = ServiceLevel / SymbolicId: False .... .... .... ..0. = ServiceLevel / LocalizedText: False .... .... .... .0.. = ServiceLevel / AdditionalInfo: False .... .... .... 0... = ServiceLevel / Inner StatusCode: False .... .... ...0 .... = ServiceLevel / Inner Diagnostics: False .... .... ..0. .... = OperationLevel / SymbolicId: False .... .... .0.. .... = OperationLevel / LocalizedText: False .... .... 0... .... = OperationLevel / AdditionalInfo: False .... ...0 .... .... = OperationLevel / Inner StatusCode: False .... ..0. .... .... = OperationLevel / Inner Diagnostics: False AuditEntryId: [OpcUa Null String] TimeoutHint: 120000 AdditionalHeader: ExtensionObject TypeId: ExpandedNodeId EncodingMask: 0x00, EncodingMask: Two byte encoded Numeric .... 0000 = EncodingMask: Two byte encoded Numeric (0x0) .0.. .... = has server index: False 0... .... = has namespace uri: False Identifier Numeric: 0 EncodingMask: 0x00 .... ...0 = has binary body: False .... ..0. = has xml body: False MaxAge: 0 TimestampsToReturn: Both (0x00000002) NodesToRead: Array of ReadValueId ArraySize: 1 [0]: ReadValueId NodeId: NodeId .... 0001 = EncodingMask: Four byte encoded Numeric (0x1) Namespace Index: 1 Identifier Numeric: 1002 AttributeId: Value (0x0000000d) IndexRange: [OpcUa Null String] DataEncoding: QualifiedName Id: 0 Name: [OpcUa Null String] Frame 336: 144 bytes on wire (1152 bits), 144 bytes captured (1152 bits) on interface 0 Interface id: 0 (enp0s25) Encapsulation type: Ethernet (1) Arrival Time: May 8, 2018 15:30:51.109660878 CEST [Time shift for this packet: 0.000000000 seconds] Epoch Time: 1525786251.109660878 seconds [Time delta from previous captured frame: 0.002167740 seconds] [Time delta from previous displayed frame: 0.002167740 seconds] [Time since reference or first frame: 14.153343981 seconds] Frame Number: 336 Frame Length: 144 bytes (1152 bits) Capture Length: 144 bytes (1152 bits) [Frame is marked: False] [Frame is ignored: False] [Protocols in frame: eth:ethertype:ip:tcp:opcua] [Coloring Rule Name: TCP] [Coloring Rule String: tcp] Ethernet II, Src: HewlettP_48:c6:07 (e4:11:5b:48:c6:07), Dst: 18:60:24:4a:be:eb (18:60:24:4a:be:eb) Destination: 18:60:24:4a:be:eb (18:60:24:4a:be:eb) Address: 18:60:24:4a:be:eb (18:60:24:4a:be:eb) .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) Source: HewlettP_48:c6:07 (e4:11:5b:48:c6:07) Address: HewlettP_48:c6:07 (e4:11:5b:48:c6:07) .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) Type: IPv4 (0x0800) Internet Protocol Version 4, Src: 192.168.20.12, Dst: 192.168.20.11 0100 .... = Version: 4 .... 0101 = Header Length: 20 bytes (5) Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT) 0000 00.. = Differentiated Services Codepoint: Default (0) .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0) Total Length: 130 Identification: 0xc6d5 (50901) Flags: 0x02 (Don't Fragment) 0... .... = Reserved bit: Not set .1.. .... = Don't fragment: Set ..0. .... = More fragments: Not set Fragment offset: 0 Time to live: 64 Protocol: TCP (6) Header checksum: 0xca38 [validation disabled] [Header checksum status: Unverified] Source: 192.168.20.12 Destination: 192.168.20.11 [Source GeoIP: Unknown] [Destination GeoIP: Unknown] Transmission Control Protocol, Src Port: 4334, Dst Port: 34907, Seq: 161, Ack: 337, Len: 90 Source Port: 4334 Destination Port: 34907 [Stream index: 4] [TCP Segment Len: 90] Sequence number: 161 (relative sequence number) [Next sequence number: 251 (relative sequence number)] Acknowledgment number: 337 (relative ack number) Header Length: 20 bytes Flags: 0x018 (PSH, ACK) 000. .... .... = Reserved: Not set ...0 .... .... = Nonce: Not set .... 0... .... = Congestion Window Reduced (CWR): Not set .... .0.. .... = ECN-Echo: Not set .... ..0. .... = Urgent: Not set .... ...1 .... = Acknowledgment: Set .... .... 1... = Push: Set .... .... .0.. = Reset: Not set .... .... ..0. = Syn: Not set .... .... ...0 = Fin: Not set [TCP Flags: ·······AP···] Window size value: 534 [Calculated window size: 534] [Window size scaling factor: -1 (unknown)] Checksum: 0xa9dc [unverified] [Checksum Status: Unverified] Urgent pointer: 0 [SEQ/ACK analysis] [This is an ACK to the segment in frame: 335] [The RTT to ACK the segment was: 0.002167740 seconds] [Bytes in flight: 90] [Bytes sent since last PSH flag: 90] [PDU Size: 90] OpcUa Binary Protocol Message Type: MSG Chunk Type: F Message Size: 90 SecureChannelId: 2 Security Token Id: 13 Security Sequence Number: 1157 Security RequestId: 1157 OpcUa Service : Encodeable Object TypeId : ExpandedNodeId NodeId EncodingMask: Four byte encoded Numeric (0x01) NodeId Namespace Index: 0 NodeId Identifier Numeric: ReadResponse (634) ReadResponse ResponseHeader: ResponseHeader Timestamp: May 8, 2018 15:30:51.109000000 CEST RequestHandle: 2677 ServiceResult: 0x00000000 [Good] ServiceDiagnostics: DiagnosticInfo EncodingMask: 0x00 .... ...0 = has symbolic id: False .... ..0. = has namespace: False .... .0.. = has localizedtext: False .... 0... = has locale: False ...0 .... = has additional info: False ..0. .... = has inner statuscode: False .0.. .... = has inner diagnostic info: False StringTable: Array of String ArraySize: 0 AdditionalHeader: ExtensionObject TypeId: ExpandedNodeId EncodingMask: 0x00, EncodingMask: Two byte encoded Numeric .... 0000 = EncodingMask: Two byte encoded Numeric (0x0) .0.. .... = has server index: False 0... .... = has namespace uri: False Identifier Numeric: 0 EncodingMask: 0x00 .... ...0 = has binary body: False .... ..0. = has xml body: False Results: Array of DataValue ArraySize: 1 [0]: DataValue EncodingMask: 0x3d, has value, has source timestamp, has server timestamp, has source picoseconds, has server picoseconds .... ...1 = has value: True .... ..0. = has statuscode: False .... .1.. = has source timestamp: True .... 1... = has server timestamp: True ...1 .... = has source picoseconds: True ..1. .... = has server picoseconds: True Value: Variant Variant Type: Double (0x0b) Double: -28,1045866269048 SourceTimestamp: May 8, 2018 15:30:21.166000000 CEST SourcePicoseconds: 1 ServerTimestamp: May 8, 2018 15:30:51.109000000 CEST ServerPicoseconds: 1 DiagnosticInfos: Array of DiagnosticInfo ArraySize: 0 ``` I tried it also as a boolean and int32 but same results. Thanks a lot. ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [May 8, 2018, 2:34pm UTC](https://forum.inductiveautomation.com/t/node-opc-ua-does-not-work/17953/4 "2018-05-08T14:34:33Z")
Can you attach an actual capture (cap/pcap) file? ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [May 8, 2018, 2:39pm UTC](https://forum.inductiveautomation.com/t/node-opc-ua-does-not-work/17953/5 "2018-05-08T14:39:26Z")
Nevermind, I’m pretty sure you’re running into [this issue.](https://github.com/eclipse/milo/issues/215) It’s fixed in Milo 0.2.1 but Ignition is currently using 0.2.0. I can build and email you an updated OPC UA module if you’d like. PM me the email address to send it to. ---
**Author:** ![smateos](https://avatars.discourse-cdn.com/v4/letter/s/a698b9/32.png) [@smateos](https://forum.inductiveautomation.com/u/smateos)\ **Post date:** [May 8, 2018, 2:57pm UTC](https://forum.inductiveautomation.com/t/node-opc-ua-does-not-work/17953/6 "2018-05-08T14:57:09Z")
Thank you! that would be great, i was exporting the pcap file but i have not enought rank to upload it. Ill sent you the pm. Edit: How do you send a PM? i can not find it ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [May 8, 2018, 3:09pm UTC](https://forum.inductiveautomation.com/t/node-opc-ua-does-not-work/17953/7 "2018-05-08T15:09:16Z")
Click on a username, then click Message. Maybe there’s some permissions preventing you from being able to send them yet. I sent the module to the email address you registered your account with. ---
**Author:** ![smateos](https://avatars.discourse-cdn.com/v4/letter/s/a698b9/32.png) [@smateos](https://forum.inductiveautomation.com/u/smateos)\ **Post date:** [May 8, 2018, 3:36pm UTC](https://forum.inductiveautomation.com/t/node-opc-ua-does-not-work/17953/8 "2018-05-08T15:36:19Z")
Thanks a lot, Did you sent it? i am checking the e-mail but I have not received it yet ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [May 8, 2018, 3:41pm UTC](https://forum.inductiveautomation.com/t/node-opc-ua-does-not-work/17953/9 "2018-05-08T15:41:22Z")
I did, maybe it’s getting filtered… Yep, your email server bounced it back. I’ll have to upload it somewhere. ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [May 8, 2018, 3:43pm UTC](https://forum.inductiveautomation.com/t/node-opc-ua-does-not-work/17953/10 "2018-05-08T15:43:59Z")
Try this: [https://www.dropbox.com/s/0nmwhjzd8p8qjmn/OPC-UA-module.modl?dl=0](https://www.dropbox.com/s/0nmwhjzd8p8qjmn/OPC-UA-module.modl?dl=0) ---
**Author:** ![Kleppe85](https://avatars.discourse-cdn.com/v4/letter/k/c4cdca/32.png) [@Kleppe85](https://forum.inductiveautomation.com/u/Kleppe85)\ **Post date:** [May 9, 2018, 6:41am UTC](https://forum.inductiveautomation.com/t/node-opc-ua-does-not-work/17953/11 "2018-05-09T06:41:43Z")
After ugrading to Ignition 7.9.7, I have similar issues with one of my onboard OPC UA servers (Lenze PLC, CodeSys based). This was not a problem in Ignition 7.9.5. So I ended up downgrading. If I add to many tags at the same time, I get the following error message in the log. “org.eclipse.milo.opcua.stack.core.UaSerializationException: request exceeds remote max message size: 134327 \> 65535” ---
**Author:** ![smateos](https://avatars.discourse-cdn.com/v4/letter/s/a698b9/32.png) [@smateos](https://forum.inductiveautomation.com/u/smateos)\ **Post date:** [May 9, 2018, 7:22am UTC](https://forum.inductiveautomation.com/t/node-opc-ua-does-not-work/17953/12 "2018-05-09T07:22:32Z")
Thanks a lot, it worked fine. ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [May 9, 2018, 12:29pm UTC](https://forum.inductiveautomation.com/t/node-opc-ua-does-not-work/17953/13 "2018-05-09T12:29:59Z")
Is the switch to Milo-0.2.1 going to be in v7.9.8? ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [May 9, 2018, 12:36pm UTC](https://forum.inductiveautomation.com/t/node-opc-ua-does-not-work/17953/14 "2018-05-09T12:36:15Z")
> [@Kleppe85](#): > > If I add to many tags at the same time, I get the following error message in the log."org.eclipse.milo.opcua.stack.core.UaSerializationException: request exceeds remote max message size: 134327 \> 65535" I don't think that's the same issue. > [@pturmel](#): > > Is the switch to Milo-0.2.1 going to be in v7.9.8? Yes, snuck it in there... ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [May 17, 2018, 1:16pm UTC](https://forum.inductiveautomation.com/t/node-opc-ua-does-not-work/17953/15 "2018-05-17T13:16:38Z")
Split this topic on May 17, 2018, 1:16pm UTC 4 posts were split to a new topic: [Siemens NegotiatePDURequest timeout on UA beta module](https://forum.inductiveautomation.com/t/siemens-negotiatepdurequest-timeout-on-ua-beta-module/18074)