There is a new TCP/IP APAR available to get the product to the latest service level.
IBM TCP/IP for VSE/ESA 1.5F
APAR PI34507 (PTF UI25359 and UI25360): APAR WITH FIXES (ZAPS) FOR TCP/IP 1.5 SERVICE PACK F. ( TCPIP15F / SERV150F )
The following ZAPs are shipped within one PTF:
ZP15F017 An upgrade to a DNS server results in "entry not found" by client.
ZP15F049 Connect_Sequence fails to be enforced.
ZP15F050 Unnecessary diagnostics dumps during cleanup.
ZP15F058 Multiple subtasks reset job step time.
ZP15F061 CICS Web Services fails with latest browser.
ZP15F101 In some situations, XMOVE error will occur on fast SOCKET CLOSE.
ZP15F102 IBM VSAM Redirector subtask abends in CICS partition.
ZP15F104 Power may incorrectly insert a large series of null lines as "blank" pages.
ZP15F107 Detection of CICS with subtask not under CICS control.
ZP15F108 CICS Web Services shuts down with DFHSO0102.
ZP15F110 Added SSL204 warning level message.
ZP15F114 CICS Web Services fails with DFHSO0102 message.
ZP15F117 CICS Web Services fails with PORTQueing.
ZP15F119 IPN411I >Undefined< Delayed commands now being issued.
ZP15F120 Message TCP905D was truncating the "Action" field.
ZP15F121 Detection of CICS with subtask not under CICS control.
ZP15F126 Add asynch diagnostic IPN898I message.
ZP15F127 Correct storing of BSD socket number.
ZP15F128 Allow givesocket of closed socket.
ZP15F129 TELNET01 application only uses line mode.
ZP15F130 "IPN411I >Undefined<" message incorrectly displays.
ZP15F153 If "USER TABLE" missing, table doesn't load and no error displayed.
ZP15F370 FTP303E PROGRAM CHECK FTPBATCH.
ZP15F378 IPN123I CSOCKET FREEVIS and IPN695C Abend in TKAB1000.
ZP15F410 TLS server rejects SSL30 client_hello.
ZP15F444 Poor performance during ascii file transfer.
ZP15F487 FTP303E ABEND FTPX1000 PSW=07DD3000 80000002 CODE=20 INT=0001.
ZP15F596 IPN166E Application Program Abend at xxxxxxxx. Phase: IPNCICMP, Offset: 31E.
ZP15F599 Added new message TEL958I when user abnormally disconnects.