2536904 - Sapstartsrv does not accept new requests due to pending CLOSE_WAIT entries

• Sapstartsrv process no longer accept connections and no longer responds to web method requests.
• Attempts to issue web method commands to the affected process turns out like below example:

sapcontrol -nr 00 -function GetSystemInstanceList

FAIL: NIECONN_BROKEN (Broken pipe), NiRawWrite failed in plugin_sapfsend()

• At OS / network level, it is possible to find many unfinished connections on which the affected sapstartsrv process acts as server:

netstat -nap | grep 50013

tcp 1 0 <server_IP>:50013 <client_IP>:19571 CLOSE_WAIT 122984/sapstartsrv
tcp 1 0 <server_IP>:50013 <client_IP>:29525 CLOSE_WAIT 122984/sapstartsrv
tcp 1 0 <server_IP>:50013 <client_IP>:19608 CLOSE_WAIT 122984/sapstartsrv
(...)

*** SAPSTARTSRV process listens on port 5$$13 where the $$ stands for the instance number.
*** The port "50013" was used in this example as the affected sapstartsrv was the one associated with instance "00".

• SAP Netweaver
• ABAP Startup framework
• UNIX based Operating Systems

startup, SUM, webmethod, connection, socket, sapstream, sapcontrol, intialization, CLOSE_WAIT, network issue, connection cannot be closed, NIECONN_BROKEN , KBA , BC-CST-STS , Startup Service , Problem