Modality Work List Server (SCP) is not responding occasionally

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steveyuan87
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Joined: Wed, 2023-07-12, 12:57

Modality Work List Server (SCP) is not responding occasionally

#1 Post by steveyuan87 »

Hi!

We have setup wlmscpfs to a GE imaging device. Most time it can query fine with findscu with a few keys such as PatientName. However, modality Work List Server (SCP) is not responding occasionally.

Here is the query ..

Code: Select all

 
D: Association Received: 10.10.20.10
D: setting network send timeout to 60 seconds
D: setting network receive timeout to 60 seconds
D: PDU Type: Associate Request, PDU Length: 184 + 6 bytes PDU header
D:   01  00  00  00  00  b8  00  01  00  00  52  41  59  50  4c  55
D:   53  57  4c  53  20  20  20  20  20  20  50  54  43  54  20  20
D:   20  20  20  20  20  20  20  20  20  20  00  00  00  00  00  00
D:   00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00
D:   00  00  00  00  00  00  00  00  00  00  10  00  00  15  31  2e
D:   32  2e  38  34  30  2e  31  30  30  30  38  2e  33  2e  31  2e
D:   31  2e  31  20  00  00  33  01  00  00  00  30  00  00  16  31
D:   2e  32  2e  38  34  30  2e  31  30  30  30  38  2e  35  2e  31
D:   2e  34  2e  33  31  40  00  00  11  31  2e  32  2e  38  34  30
D:   2e  31  30  30  30  38  2e  31  2e  32  50  00  00  20  51  00
D:   00  04  00  00  ff  b8  52  00  00  14  31  2e  32  2e  38  34
D:   30  2e  31  31  33  36  31  39  2e  36  2e  34  33  31
D: Parsing an A-ASSOCIATE PDU
I: Association Received (10.10.20.10:PTCT -> RWLS)
D: Parameters:
D: ====================== BEGIN A-ASSOCIATE-RQ =====================
D: Our Implementation Class UID:      1.2.276.0.7230010.3.0.3.6.6
D: Our Implementation Version Name:   OFFIS_DCMTK_366
D: Their Implementation Class UID:    1.2.840.113619.6.431
D: Their Implementation Version Name:
D: Application Context Name:    1.2.840.10008.3.1.1.1
D: Calling Application Name:    PTCT
D: Called Application Name:     RWLS
D: Responding Application Name:
D: Our Max PDU Receive Size:    65464
D: Their Max PDU Receive Size:  65464
D: Presentation Contexts:
D:   Context ID:        1 (Proposed)
D:     Abstract Syntax: =FINDModalityWorklistInformationModel
D:     Proposed SCP/SCU Role: Default
D:     Proposed Transfer Syntax(es):
D:       =LittleEndianImplicit
D: Requested Extended Negotiation: none
D: Accepted Extended Negotiation:  none
D: Requested User Identity Negotiation: none
D: User Identity Negotiation Response:  none
D: ======================= END A-ASSOCIATE-RQ ======================
D: Constructing Associate AC PDU
.. and it just stop on the step of constructing Associate AC PDU without further moves. Generally, it should begin A-ASSOCIATE-AC.

As the problem happens occasionally, we have excluded the IP or port conflict. What am I missing here?

Thanks in advance. I have confused with it a few days.

Michael Onken
DCMTK Developer
Posts: 2067
Joined: Fri, 2004-11-05, 13:47
Location: Oldenburg, Germany
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Re: Modality Work List Server (SCP) is not responding occasionally

#2 Post by Michael Onken »

If this is on Windows, I sometimes experienced that the cmd.exe window was the reason and hitting Enter in it helped. I think this only happens if the window is or was focused. I don't know what the underlying reason is, though. Also try option -dhl (on any OS) which avoids that DNS lookup runs into a long timeout. No other ideas right now...

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