Faied to send MPPS Command

[yadavvirus]

While using Worklist SCP finding patient is success. But after fetcing info getting this error.

Error on Modality

Log in Modality is
Started logging into new stream
Logging into file: C:\Users\BPYADAV\Documents\MODALIZERPLUS\LOGS\LastMPPSCreate.log
2022-03-0813:57:07.196000 15868 INFO Association Request Parameteres:
Our Implementation Class UID: 2.16.124.113543.6021.1
Our Implementation Version Name: RZDCX_3_1_0_11
Their Implementation Class UID:
Their Implementation Version Name:
Application Context Name: 1.2.840.10008.3.1.1.1
Calling Application Name: ModalitySCU
Called Application Name: QRSCP
Responding Application Name: resp AP Title
Our Max PDU Receive Size: 32768
Their Max PDU Receive Size: 0
Presentation Contexts:
Context ID: 1 (Proposed)
Abstract Syntax: =VerificationSOPClass
Proposed SCP/SCU Role: Default
Accepted SCP/SCU Role: Default
Proposed Transfer Syntax(es):
=LittleEndianExplicit
=BigEndianExplicit
=LittleEndianImplicit
Context ID: 3 (Proposed)
Abstract Syntax: =ModalityPerformedProcedureStepSOPClass
Proposed SCP/SCU Role: Default
Accepted SCP/SCU Role: Default
Proposed Transfer Syntax(es):
=LittleEndianImplicit
Requested Extended Negotiation: none
Accepted Extended Negotiation: none

2022-03-0813:57:07.206000 15868 INFO Association Request Result: Normal
Association Response Parameteres:
Our Implementation Class UID: 2.16.124.113543.6021.1
Our Implementation Version Name: RZDCX_3_1_0_11
Their Implementation Class UID: 1.3.6.1.4.1.30071.8
Their Implementation Version Name: fo-dicom 5.0.2
Application Context Name: 1.2.840.10008.3.1.1.1
Calling Application Name: ModalitySCU
Called Application Name: QRSCP
Responding Application Name: QRSCP
Our Max PDU Receive Size: 32768
Their Max PDU Receive Size: 262144
Presentation Contexts:
Context ID: 1 (Accepted)
Abstract Syntax: =VerificationSOPClass
Proposed SCP/SCU Role: Default
Accepted SCP/SCU Role: Default
Accepted Transfer Syntax: =LittleEndianExplicit
Context ID: 3 (Accepted)
Abstract Syntax: =ModalityPerformedProcedureStepSOPClass
Proposed SCP/SCU Role: Default
Accepted SCP/SCU Role: Default
Accepted Transfer Syntax: =LittleEndianImplicit
Requested Extended Negotiation: none
Accepted Extended Negotiation: none

2022-03-0813:57:07.206000 15868 INFO DIMSE receiveCommand
2022-03-0813:57:17.207000 15868 ERROR In DCXREQ, Code: 519, Text: DIMSE No data available (timout in non-blocking mode)
Stopped Logging.

Please Help

[yadavvirus]

Is there someone who can help me in above?

[gofal]

The code provided here are just samples. This is not production ready code!

The exception shows you exactly the stacktrace, so you can locate the error easily.

In WorklistService.OnNCreateRequestAsync the code accesses a Tag, that is not present:
var affectedSopInstanceUID = request.Command.GetSingleValue(DicomTag.AffectedSOPInstanceUID);
So you have to secure that method. E.g. first check if the Tag exists before accessing it. Debug, what kind of messages the modality sends so that you can answer correctly. Etc.