3028932 - sapcontrol returns NIECONN_REFUSED for a remote instance

The following error message is received when trying to start (or stop) SAP with the command "sapcontrol -nr XX -function StartSystem" (or "StopSystem"; "XX" stands for the Instance number):

FAIL: NIECONN_REFUSED (Connection timed out), NiRawConnect failed in plugin_fopen(), <errordetails xmlns="urn:SAPControl"><errordetails xmlns="urn:SAPControl">Checking Start permission on http://<remote server>:5XX13 failed: NIECONN_REFUSED (Connection timed out), NiRawConnect failed in plugin_fopen()</errordetails></errordetails>

- Notice that the protocol might be https, in which case the port changes to 5XX14 ("...Checking Start permission on https://<remote server>:5XX14 failed...")

- The error code might also be "NIECONN_REFUSED (No route to host)"

Other scenarios where the issue can happen are:

• if sapcontrol is used to connect directly to a remote instance, for example:
   
     sapcontrol -host <remote server> -queryuser -nr XX -function <any function>
   
• during a Rolling Kernel Switch (RKS) procedure, with the command:
  
     sapcontrol -nr XX -function CheckUpdateSystem YYY ZZZ

• SAP Netweaver release independent
• ABAP Platform release independent
• Client/Server Technology - Startup Service

Rolling Kernel Switch, RKS, CheckUpdateSystem, StopSystem, StartSystem, Sapcontrol, NIECONN_REFUSED , KBA , BC-CST-STS , Startup Service , HAN-DB , SAP HANA Database , BC-UPG-TLS-TLA , Upgrade tools for ABAP , BC-CST , Client/Server Technology , BC-UPG-TLS-TLJ , Upgrade tools for Java , BC-JAS , NetWeaver Application Server Java , Problem