{{Quickfixn}} System.Net.Sockets.SocketException (10054)

[Mario Alberti]

What could be the reason of this exception?
20210504-20:12:41.452 : Created session
20210504-20:12:41.475 : Connecting to 127.0.0.1 on port 8080
20210504-20:12:41.513 : Connection succeeded
20210504-20:12:41.521 : Session reset: ResetOnLogon
20210504-20:12:41.537 : Session reset: ResetSeqNumFlag
20210504-20:12:41.540 : Initiated logon request
20210504-20:12:42.424 : Sequence numbers reset due to ResetSeqNumFlag=Y
20210504-20:12:42.426 : Received logon



*20210504-20:12:43.435 : Session FIXT.1.1:USER->NQT disconnecting:
System.Net.Sockets.SocketException (10054): An existing connection was
forcibly closed by the remote host   at
QuickFix.SocketInitiatorThread.ReadSome(Byte[] buffer, Int32
timeoutMilliseconds)   at
QuickFix.SocketInitiatorThread.Read()20210504-20:12:43.437 : Session reset:
ResetOnDisconnect*


*----CaseLogon is successfully done, after that I ask for the
securityList and I got the first securityListResponse and then the logout
is forced. The same happens with *NewOrderSingle, it is place in the market
with no trouble but push me to logout.

20210504-20:12:41.539 : 8=FIXT.1.1 9=126 35=A 34=1 49=USER
52=20210504-20:12:41.523 56=NQT 98=0 108=30 141=Y 553=USER 554=password
1137=9 10=223
20210504-20:12:42.401 : 8=FIXT.1.1 9=90 35=A 34=1 49=NQT
52=20210504-20:12:43.108 56=USER 98=0 108=30 141=Y 1137=9 10=146
20210504-20:12:42.430 : 8=FIXT.1.1 9=117 *35=x* 34=2 49=USER
52=20210504-20:12:42.430 56=NQT 115=USER 128=NQT 263=1 320=012 559=4 10=131
20210504-20:12:42.871 : 8=FIXT.1.1 9=28049 35=y 34=2 49=NQT
52=20210504-20:12:43.366 56=USER 320=012 322=597242963205519 393=293 559=4
560=0 893=Y LONGMESSAGEXXXX 10=233
20210504-20:12:42.886 : 8=FIXT.1.1 9=90 35=5 34=3 49=USER
52=20210504-20:12:42.886 56=NQT 58=*Incorrect BeginString* 10=219
20210504-20:12:42.887 : 8=FIXT.1.1 9=477 35=y 34=3 49=NQT
52=20210504-20:12:43.369 56=USER 320=012 322=597242964876827 393=293 559=4
560=0 893=Y LONGMESSAGEXXXX 10=028
20210504-20:12:42.896 : 8=FIXT.1.1 9=90 35=5 34=4 49=USER
52=20210504-20:12:42.895 56=NQT 58=*Incorrect BeginString* 10=220
20210504-20:12:42.896 : 8=FIXT.1.1 9=444 35=y 34=4 49=NQT
52=20210504-20:12:43.369 56=USER 320=012 322=597242964907371 393=293 559=4
560=0 893=Y LONGMESSAGEXXXX 10=160

The counterparty says that they received and respond with no exception the
message. So they are no forcing the logout, according to them.

Any idea would be helpfull.
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