Event ID - 203

Event Id203
SourceTN3270 server
DescriptionWindows Sockets API call getnamebyaddr(xxx.xxx.xxx.xxx) failed in function TCPSessionInitialize with return code WSANO_DATA.
Event InformationYou cannot find the getnamebyaddr application programming interface (API) after you configure TN3270 Server to resolve IP addresses to NetBIOS names and this process fails causing the above event in the system log.
CAUSE:
The API getnamebyaddr does not exist. Instead, Event 203 should refer to the API call gethostbyaddr. 
For more information about this event click the link given below.
Reference Links Cannot Find API getnamebyaddr Referred to in TN3270 Event 203

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