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Tested Security and Authentication Modes

I've also successfully tested authentication against the following servers in the latest version

Kepware v6

Authentication

• Anonymous
• Username

Security Policy	Security Mode
None	None
Basic128Rsa15	Sign
Basic128Rsa15	SignAndEncrypt
Basic256	Sign
Basic256	SignAndEncrypt

Ignition 8 (Eclipse Milo)

Authentication

• Anonymous
• Username

Security Policy	Security Mode
None	None
Basic128Rsa15	SignAndEncrypt
Basic256	SignAndEncrypt
Basic256Sha256	SignAndEncrypt
Aes128_Sha256_RsaOaep	SignAndEncrypt
Aes256_Sha256_RsaPss	SignAndEncrypt

OPC UA ANSI C Demo Server v1.8.3

https://www.unified-automation.com/downloads/opc-ua-servers/file/download/details/opc-ua-ansi-c-demo-server-v183-windows.html

Authentication

• Anonymous

Security Policy	Security Mode
Basic256Sha256	Sign
Basic256Sha256	SignAndEncrypt
Aes128_Sha256_RsaOaep	Sign
Aes128_Sha256_RsaOaep	SignAndEncrypt
Aes256_Sha256_RsaPss	Sign
Aes256_Sha256_RsaPss	SignAndEncrypt

Prosys Simulation Server

Authentication

• Anonymous
• Username
• Certificate

Security Policy	Security Mode
None	None
Basic128Rsa15	Sign
Basic128Rsa15	SignAndEncrypt
Basic256	Sign
Basic256	SignAndEncrypt
Basic256Sha256	Sign
Basic256Sha256	SignAndEncrypt

Siemens PLC 1500

Authentication

• Anonymous

Security Policy	Security Mode	Status
None	None	OK
Basic128Rsa15	Sign	OK
Basic128Rsa15	SignAndEncrypt	OK
Basic256	Sign	OK
Basic256	SignAndEncrypt	OK
Basic256Sha256	Sign	StatusBadSecurityChecksFailed (0x80130000)
Basic256Sha256	SignAndEncrypt	StatusBadSecurityChecksFailed (0x80130000)