I added th eline to the conf file and rebooted the machine. The problem 
persists :-(
by the value of tcpOutDataBytes before and after (diff=33kB) I assume that the 
packets indeed never left the server and were eaten by the driver.

Is there any other setting I could try ?

TIA


# netstat -s -P tcp                   

TCP     tcpRtoAlgorithm     =     4     tcpRtoMin           =   400
        tcpRtoMax           = 60000     tcpMaxConn          =    -1
        tcpActiveOpens      =   136     tcpPassiveOpens     =    14
        tcpAttemptFails     =   114     tcpEstabResets      =     2
        tcpCurrEstab        =     4     tcpOutSegs          = 20439
        tcpOutDataSegs      =138055     tcpOutDataBytes     =166685311
        tcpRetransSegs      =   698     tcpRetransBytes     =792854   
        tcpOutAck           =   324     tcpOutAckDelayed    =   187   
        tcpOutUrg           =     0     tcpOutWinUpdate     =     0   
        tcpOutWinProbe      =     0     tcpOutControl       =   324   
        tcpOutRsts          =   114     tcpOutFastRetrans   =     1   
        tcpInSegs           = 14060                                   
        tcpInAckSegs        = 72045     tcpInAckBytes       =166678755
        tcpInDupAck         =    58     tcpInAckUnsent      =     0   
        tcpInInorderSegs    =  4696     tcpInInorderBytes   =253647   
        tcpInUnorderSegs    =     0     tcpInUnorderBytes   =     0   
        tcpInDupSegs        =     4     tcpInDupBytes       =     4   
        tcpInPartDupSegs    =     0     tcpInPartDupBytes   =     0   
        tcpInPastWinSegs    =     0     tcpInPastWinBytes   =     0   
        tcpInWinProbe       =     0     tcpInWinUpdate      =     0   
        tcpInClosed         =     2     tcpRttNoUpdate      = 52732   
        tcpRttUpdate        = 19292     tcpTimRetrans       =   343   
        tcpTimRetransDrop   =     2     tcpTimKeepalive     =    35   
        tcpTimKeepaliveProbe=     0     tcpTimKeepaliveDrop =     0   
        tcpListenDrop       =     0     tcpListenDropQ0     =     0   
        tcpHalfOpenDrop     =     0     tcpOutSackRetrans   =    11   

# scp core [email protected]:/tmp
[email protected]'s password:    
core                   2% |*                                                    
                                     |  2048 KB  - stalled -^CKilled by signal 
2.                                                                              
                                           

# netstat -s -P tcp

TCP     tcpRtoAlgorithm     =     4     tcpRtoMin           =   400
        tcpRtoMax           = 60000     tcpMaxConn          =    -1
        tcpActiveOpens      =   140     tcpPassiveOpens     =    14
        tcpAttemptFails     =   117     tcpEstabResets      =     2
        tcpCurrEstab        =     5     tcpOutSegs          = 20516
        tcpOutDataSegs      =138120     tcpOutDataBytes     =166718411
        tcpRetransSegs      =   718     tcpRetransBytes     =810420
        tcpOutAck           =   336     tcpOutAckDelayed    =   191
        tcpOutUrg           =     0     tcpOutWinUpdate     =     0
        tcpOutWinProbe      =     0     tcpOutControl       =   331
        tcpOutRsts          =   117     tcpOutFastRetrans   =     1
        tcpInSegs           = 14146
        tcpInAckSegs        = 72095     tcpInAckBytes       =166698627
        tcpInDupAck         =    60     tcpInAckUnsent      =     0
        tcpInInorderSegs    =  4730     tcpInInorderBytes   =257068
        tcpInUnorderSegs    =     0     tcpInUnorderBytes   =     0
        tcpInDupSegs        =     4     tcpInDupBytes       =     4
        tcpInPartDupSegs    =     0     tcpInPartDupBytes   =     0
        tcpInPastWinSegs    =     0     tcpInPastWinBytes   =     0
        tcpInWinProbe       =     0     tcpInWinUpdate      =     0
        tcpInClosed         =     2     tcpRttNoUpdate      = 52743
        tcpRttUpdate        = 19331     tcpTimRetrans       =   350
        tcpTimRetransDrop   =     2     tcpTimKeepalive     =    35
        tcpTimKeepaliveProbe=     0     tcpTimKeepaliveDrop =     0
        tcpListenDrop       =     0     tcpListenDropQ0     =     0
        tcpHalfOpenDrop     =     0     tcpOutSackRetrans   =    11

#
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