Below
info is used for troubleshooting intermittent connection issues with in SAP
system.
In
general, intermittent connection loss occurs with below two reasons
1.
If there is a crash in the dispatcher process of the instance to
which the client was connected.
2.
Network Problems (Firewall idle timeout, Black Hole Router, VPN,
WAN problems)
For first
case, if there is a crash with dispatcher process, This triggers a TCP
package with an activated RST flag, which is sent to all connected
communication partners and triggers the error message described above in the
SAP GUI, among others. All connections will then automatically broken.
For second
case, regarding network problems, we need to perform checks with NIPING
which tests the performace of packet transmission in TCP layer.
NIPING
generally checks the packet transmission in TCP layer of the network where all
SAP transactions takes place.
we
may not see any packet loss while we ping the servers from terminal and
vice-versa. but if you see errors in NIPING trace, you need to fix it based on
the error. Mostly it will be of network issue and some times it may be due to
OS.
To
check the connectivity using NIPING tool, We need to start NIPING server at SAP
level and trigger the NIPING packet transmission from the frontend terminal.
Use
below commands
To do
this test, it is required to start NIPING as a server in one host:
>
niping -s -I 0 -T NIPING_SERVER_TRACE
In
the remote host is is required to start NIPING as a client:
>
niping -c -H <SAP HOST NAME> -X3 -B 10 -D 30 -T NIPING_CLIENT_TRACE
Also
check dispatcher logs of all the application servers.
we
need to get below details from the user
- SAP GUI
version and patch level
- Windows
version and patch level
- If
they had done any upgrades at frontend like windows and sapgui
- If
they are facing issue with any particular transactions or for every
transactions
- If
they are facing issue during particular time
- How are
they connected to SAP system, using any VPN or direct client network
- Are
they facing issue with SAP only or with any other applications are also
crashing
- If
they are using wired connection or wireless.
