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We use ERPConnect in our ASP.NET application but sometimes we get some error messages when users try to connect to SAP through our application.\[quote\] CPIC-CALL: 'CMRCV : rc=19 LOCATION SAP-Gateway on host SERVERNAME / sapgw10 ERROR Conversation 53230591 not found TIME Wed Nov 16 13:49:58 2011 RELEASE 701 COMPONENT SAP-Gateway VERSION 2 RC 728 MODULE gwxxrd.c LINE 6278 COUNTER 1277701 \[/quote\]It always happens when opening a connection to SAP through ERPConnect.\[code\]R3Connection connection = Connection;connection.Open(); // the error occurs here\[/code\]It's quite random. Some days we don't get any error message, other days we get 20 messages a day.ERPConnect uses librfc32.dll defined in the System32-folder and has version 7200.1.39.6461 (which is a recent version).This issue didn't occur on my local development machine (Windows 7 x86). It always occurs on our production server (Windows Server 2008 R2).Any idea what could cause this issue?Edit (added error log extract):\[quote\] \[code\]* * LOCATION SAP-Gateway on host HERCULES / sapgw10 * ERROR partner 'hercules:sapgw01' not reached * * TIME Thu Nov 24 09:10:20 2011 * RELEASE 701 * COMPONENT NI (network interface) * VERSION 38 * RC -10 * MODULE nixxi.cpp * LINE 2835 * DETAIL NiPConnect2 * SYSTEM CALL connect * ERRNO 10061 * ERRNO TEXT WSAECONNREFUSED: Connection refused * COUNTER 1385122 * ***************************************************************************** \[/code\]\[/quote\]\[code\]GwTraceHdlInfo: HANDLE = 137 TIME = Thu Nov 24 09:10:19 2011 SOCKET = 2108 STAT = NI_CONN_WAIT TYPE = STREAM IPv4 OUT = 0 messages 0 bytes IN = 0 messages 0 bytes LOCAL = 0.0.0.0:1865 REMOTE = - OPTIONS = BUFFERED ni hdl = 137 type = CLIENT net_stat = CONNECT_TO_REM_GW_PENDING hostaddr = 100.100.103.15 accept_hostaddr = 100.100.103.15 opcode = NORMAL_CLIENT conn opcode = REMOTE_GATEWAY conn vers = 2 index = 10 data = http://stackoverflow.com/questions/8152398/0000000000000000 ext_info = 000000000EF1D870 offset = 0 rest_len = 0 snc_forced = 0 remote gateway infos: hostname = hostaddr = 100.100.103.15 service = sapgw01 tpname = sapdp01 GwSelClear: clear RWC for hdl 137 NiICloseHandle: called for hdl 137 while waiting for connection NiICloseHandle: shutdown and close hdl 137 / sock 2108 GwFreeHdlInfoMemory: free 000000000EF1D870 (ext info) GwIFreeMemForLU_TP: freed memory for sys 10 GwListRemove: remove elem 10 from sys_r3_list GwListRemove: 2 elems in sys_r3_list GwListRemove: elem 10 not in sys_reg_list GwListRemove: remove elem 10 from sys_inuse_list GwListRemove: 104 elems in sys_inuse_list GwUpdateClient: act_sys: 104 GwIDelR3Conn: send error message to client GwSendRc3: send (appc_rc=CM_PRODUCT_SPECIFIC_ERROR / sap_rc=GW_CONNECT_FAILED) to client HERCULES / sapgw10 (0) GwRqDpSendTo: (HERCULES / sapgw10, gw_id=0, appc_ca_blk=-1, len=335, comm_index=-1) LOCK APPC ca_blk 3 DpGetCpicCommIdx: found index 3 via appc_hdr found comm entry 3 (tid/uid/mode/conv_id/a_r: 158/13268/0/ /0) GwIsAWaitingSWP: wp 1 waiting GwSapWpWakeUp: send answer to sap wp 1 GwSapWpWakeUp: make wp 1 owner of appc_ca_blk 3 -OUT- tid -1 uid -1 mode 255 -OUT- appc_ca_blk 3 len 335 rq_id 43133 -OUT- wait_f_answ 0 cmd 0 NiIWrite: hdl 109 sent data (wrt=28,pac=1,MESG_IO) GwIDelR3Conn: decrement conv_no of client 0: 5 GwFreeMemory: free 000000000EEF3480 (len=3700) GwFreeMemory: act_overflow_size = 20352 (- 3700) GwIDelR3Conn: idx/conv = ((-1/0) | (10/0)), delete conv 48 from conv-table GwClearConn: conv_no/tcp_conv_no/sna_conv_no: 6/6/0 GwClearConn: free r3 conv info GwClearConn: free buffer info GwFiSearchConvId: deleted 27077110 local, conn=48 GwListInsert: insert elem 48 into conn_free_list (at begin) GwListInsert: 494 elems in conn_free_list GwListRemove: remove elem 48 from conn_search_list GwListRemove: 0 elems in conn_search_list GwListRemove: elem 48 not in conn_write_list GwListRemove: remove elem 48 from conn_inuse_list GwListRemove: 6 elems in conn_inuse_list GwReadReqIndex: (process_id: -1) GwReadReqIndex: no filled request-index-block GwCheckClient: check clients LOCK APPC ca_blk 4 GwCheckClient: raise timeout for conv 27059938 (intr/uid/mode/comm_idx=9/13261/0/90) GwSendRcToDp: send appc_rc/sap_rc 10001/221 to dp make DISP owner of appc_ca_blk 4 DpSemRq: key: 3, units: 1, timeout: -1 DpSemRel: key: 3, units: 1 DpRqPutIntoQueue: put request into queue (reqtype 0, prio LOW, rq_id 43134) GwDispWakeUp: send wakeup with ni handle 2 NiIWrite: hdl 2 sent data (wrt=1,pac=1,MESG_IO) -OUT- sender_id APPC_SERVER tid 165 wp_ca_blk -1 wp_id -1 -OUT- action SEND_TO_WP uid 13261 appc_ca_blk 4 type NOWP -OUT- new_stat NO_CHANGE mode 0 len 80 rq_id 43134 GwListRemove: remove elem 90 from comm_wait_list GwListRemove: 0 elems in comm_wait_list GwListRemove: remove elem 90 from comm_wait_list GwListRemove: 0 elems in comm_wait_list \[/code\]Edit 2: added code exampleI've created a little code example and if noticed that at the end one connection remains open. If I start the example again, two connections remain open at the end of the example.So something is going wrong...\[code\]protected void SAP( object sender, EventArgs e ) { ThreadStart threadStart1 = new ThreadStart( CreateSAP ); Thread thread = new Thread( threadStart1 ); Thread thread2 = new Thread( threadStart1 ); thread.Start(); Thread.Sleep( 2000 ); thread2.Start(); while ( thread2.IsAlive ) { } Response.Write( "done" );}private void CreateSAP() { R3Connection conn = ERPConnection.Connection; conn.MultithreadingEnvironment = true; for ( int i = 0; i < 12; i++ ) { try { conn.Open(); Thread.Sleep( 1000 ); } finally { conn.Close(); } }}\[/code\]