Losing the connection to sap server

Hello guys ,
I have a serious problem that i face losing connection between the terminals and the server, but I can still ping the server from those disconnected computers, the following is a sample to the error from the event viewer of the SAP server.
source : SAPGEP_00
category : None
event ID : 35712
type : error
description : SAP-Basis System Operating system call 
rec failed ( error no. 10054)
then the following error
source : SAPGEP_00
category : None
event ID : 35698
type : error
description : SAP-Basis System Connection to user 48
( user name ), terminal 26 ( computer name ) lost
the user no. and the terminal no. are changing all the time
to the same user and computer name.
Thanks & Best Regards,
Milad

Hello - I believe this is a duplicate entry but the advise will repeat.
Hello
Some testing regarding the connectivity between the affected terminals and hosts is advised, use the information outlined in the following to further the analysis.
500235 - Network Diagnosis with NIPING
413330 - Network timeouts
Following full analysis as outlined in the above notes,
if the problem continues proceed with the
results from all tests outlined in the above notes and:
26086 TCP/IP Connection to partner broken
Check the following Note in relation
correcting DNS settings:
124562 - Hostname resolution problems (DNS timeouts)
Regards.

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