SCU Store Image to SCP Sometimes error

[ZhuBingquan]

hello ,
We use dcmtk to develop our own PACS system. now we find a bug, but can't get the reason. SCU station sometimes(not usually) send dicom image to SCP station failed.
the SCP's log:
0006:020d DIMSE Failed to receive message
the SCU's log:
TCP I/O Error (No error) occurred in routine: sendAbortTCP
can you give me some advices.

[Edwarddu]

It seems it's a TCP error. Is there any firewall block the connection or some other network problem ? Can you telnet the port ?