2635464 - Mainframe Connect Error:SYBASE LISTENER SY01 SYBTP13 - NOT A RECOGNIZED SYBASE CLIENT

• DirectConnect clients receive TCP timeout errors (Resets)
• DirectCconnect logs show these messages:
  LogNotice    04/23/2018 14:15:39.644    <dc_mfc_svcenm>    1115    E944895        NETWORK ERROR: SYBTCP ERROR INFO:,
          Request(Connect),SubFunc(Failed), Request(Connect),SubFunc(Failed), SYBTCP RetCode(1) Description(SYBTCP_FAIL),
          TCP API RetCode (10060) Description(WSAE TIMEDOUT) errmsg[Win NT system call sybtcp_connect(connect),
          error num 10060, tranaction <AMD2>, region name <CICSNM>, host name <MF_host_name>, port num #### ]
  LogClientMessages    04/23/2018 14:15:39.644    pclmgw01    1115    E944895        Error: 30261 Severity: 10
          TCPIP Network Error: { [NOTCONNECTED] Lost connection to database, , Request(Connect),SubFunc(Failed),
          SYBTCP RetCode(1) Description(SYBTCP_FAIL), TCP API RetCode (10060) Description(WSAE TIMEDOUT) }
          <HostName=<MF_hostnm>, <PortNumber=####>, <Region Name=<CICSNM>, <TPName=AMD2>
  LogClientMessages    04/23/2018 14:15:39.644    <dc_srvrnm>   NULL    NULL    NULL    Error: 30000 Severity: 16 Login failure. <SMR>
  LogClientLogin       04/23/2018 14:15:39.644    <dc_mfc_svcenm>    1115    E944895        ...Connection refused by service library 'DB2'.
  
  
• CICS Message User log (CSML) Shows:
   shows:SYBTP13 - NOT A RECOGNIZED SYBASE CLIENT
  SYBTP17 – MAX SOCKETS – 5 SECOND DELAY.
  
              

• DirectConnect 15.0.1 B INTEL x386 Windows NT 
• Mainframe Connect for Server Option for CICS

MFC OSC SYBTP13 SYBTP17 , KBA , BC-SYB-MFC , Mainframe Connect (MFC) , Problem