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Hello Vijo,

Windows Server 2003 does not support TLS 1.1 and TLS 1.2, Diafaan SMS Server can only use TLS 1.2 when the Windows version supports it so it won't work in Windows Server 2003.

TLS 1.2 is only supported in Diafaan SMS Server 4.2 or higher. If your license allows the update to Diafaan SMS Server 4.2 then you can download the latest version of Diafaan SMS Server and install it over your current installation. If the free update and support period of your license is expired then you have to buy a new license to be able to use TLS 1.2.

Regards, Henk