Trying to start the SAP system and stuck with the error related to DNS.
Error as reported :
Post upgrade I was trying to start the application instance but I was unable to start the SAP instance.
I could see when issuing sapcontrol -nr $$ -function GetProcessList command the dispatcher can be seen in GRAY status indicating it is stopped.
sapcontrol -nr <instance number> -function GetProcessList
<DATE> <TIME>
GetProcessList
OK
name, description, dispstatus, textstatus, starttime, elapsedtime, pid
msg_server, MessageServer, GREEN, Running, 2017 10 26 08:00:50, 4:53:13, 12486
disp+work, Dispatcher, GRAY, Stopped, , , 12488
Identifying the issue
I could see that from the entries when the network check is being performed the conversion/resolution of service to port number is not working fine.Also there were entries were clearly it was indicating there were some issues in the network layer. (
OR maybe something was wrong in my network configuration ?)
Troubleshooting
From the GetProcessList output I was confident the issue was with the
dispatcher.So my next step was to check in the dispatcher trace file (
dev_disp).
In dispatcher trace file (dev_disp) the entries can be seen as :
*** WARNING => DpNetCheck: NiServToNo(sapdpXX) failed (rc=-3)
*** ERROR => DpNetCheck: NiServToNo(sapgwXX) failed (rc=-3) [dpxxtool2.c 6316]
***LOG GZZ=> 2 possible network problems detected - check tracefile and adjust the DNS settings [dpxxtool2.c 6454]
MtxInit: 30000 0 0
*** ERROR => DpSysAdmExtCreate: ShmCreate (CREATE) [dpxxtool2.c 648]
*** ERROR => dispatcher already running ???? [dpxxtool2.c 649]
*** ERROR => I better EXIT before I do any (more) damage [dpxxtool2.c 651]
Here I could notice 2 main functions :
1.
DpNetCheck --> This function checks the network configuration.
2.
NiServToNo --> This function convert service name to (port) number
The cause of the issue was the services sapdp<instance number> and sapgw<instance number> are missing from the services file.
Resolution <<<< luckily it worked 😉 >>>>
In order to resolve the issue I followed the below steps :
1. Maintain the services sapdpXX and sapgwXX services in
services file.
A. Location of services file for linux/unix is as /etc/services
B. Location for Windows OS is under \Windows\System32\drivers\etc\services
2. The entries in the services file should finally look like
sapdpXX#32XX/tcp## SAP System Dispatcher Port
sapgwXX#33XX/tcp## SAP System Gateway Port
To get more information on the ports and their usage please see the link
TCP/IP Ports of All SAP Products
Post maintaining the entry in the services file I was able to start the system.
🙂
Happy reading
🙂
Feel free to let me know in case any queries.
Regards,
Manjunath Hanmanthgad
