Yes there is a possibility if you are applying O.S level patches then it can effect your SAP instance running on it. Doesnt have to be windows it can happen with Unix / linux too.
I agree SAP instance has to be stopped before updating OS patch. did the same.
Before applying Symantec patch update or Windows OS update, everything was working fine in one of PI environment. After doing that having qRFC inbound queues (Smq2) entries are running status for ever.
After clearing first entry irrespective of any messages in SMQ2, other entries are going thru by unlocking...This is strange thing.
There may be possibility that windows OS level patch update or any OS update can cause in SAP server. Not sure on that.
Before applying OS level patch/Symantec patch update, everything is fine.
There is no new transport or development change after that patch update also
This is a little strange to occur. were these queues not full processes when you took your system down for patching ? or this is happening to all NEW requests which are coming ?
can you please check qrfc logs , SM21 for any signs of errors. Also if there is an issue something will get logged into work process logs. Please check and if possible attach some log files with errors.
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