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How to change the Cipher Suites of an NMC3?

Question :

How to change the Cipher Suites of an NMC3

Product Line / Environment :

Network Management Card 3 – AP9640/AP9641/ AP9643 and/or  Devices with an embedded Network Management Card 3

Answer :

Users may need to adjust the list of SSL/TLS ciphers in use for NMC web access on the NMC, to comply with local security policies, changes in browser compatibility, or to reflect ever-changing best practices.

The option to enable disable Cipher Suites In NMC3 is only accessible via Console or Command line via FTP , SSH or Terminal Emulator (i.e. Putty, TeraTerm) through a USB Connection. Please refer to the Command Line Interface Guide for Network Management Card 3 for details on how to connect via console.

The  command to be used is web with the -cs (meaning Cipher Suite) option. The syntax  would  be "web -cs <level>" specifying the level changes  the tier level of cipher suite that will be used. Value range of 0-4.   Omitting  level value displays current setting.

NOTE: The -cs option is only applied when minimum protocol is set to TLS v1.2 using the -mp option.

Here are the list of what Ciphers are allowed depending on the security level:

apc>web -cs 4

TLS1.2 Cipher Suite Filter:   4

Accepted Cipher Suites:

TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256

TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

TLS_DHE_RSA_WITH_AES_128_GCM_SHA256

apc>web -cs 3

TLS1.2 Cipher Suite Filter:   3

Accepted Cipher Suites:

TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256

TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

TLS_DHE_RSA_WITH_AES_128_GCM_SHA256

TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256

TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256

TLS_DHE_RSA_WITH_AES_128_CBC_SHA256

TLS_DHE_RSA_WITH_AES_256_CBC_SHA256

apc>web -cs 2

TLS1.2 Cipher Suite Filter:   2

Accepted Cipher Suites:

TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256

TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

TLS_DHE_RSA_WITH_AES_128_GCM_SHA256

TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256

TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA

TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA

TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256

TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA

TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA

TLS_DHE_RSA_WITH_AES_128_CBC_SHA256

TLS_DHE_RSA_WITH_AES_256_CBC_SHA256

TLS_DHE_RSA_WITH_AES_128_CBC_SHA

TLS_DHE_RSA_WITH_AES_256_CBC_SHA

apc>web -cs 1

TLS1.2 Cipher Suite Filter:   1

Accepted Cipher Suites:

TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256

TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

TLS_DHE_RSA_WITH_AES_128_GCM_SHA256

TLS_RSA_WITH_AES_128_GCM_SHA256

TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256

TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA

TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA

TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256

TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA

TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA

TLS_DHE_RSA_WITH_AES_128_CBC_SHA256

TLS_DHE_RSA_WITH_AES_256_CBC_SHA256

TLS_DHE_RSA_WITH_AES_128_CBC_SHA

TLS_DHE_RSA_WITH_AES_256_CBC_SHA

TLS_RSA_WITH_AES_128_CBC_SHA256

TLS_RSA_WITH_AES_256_CBC_SHA256

TLS_RSA_WITH_AES_128_CBC_SHA

TLS_RSA_WITH_AES_256_CBC_SHA

apc>web -cs 0

TLS1.2 Cipher Suite Filter:   0

Accepted Cipher Suites:

TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256

TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

TLS_DHE_RSA_WITH_AES_128_GCM_SHA256

TLS_RSA_WITH_AES_128_GCM_SHA256

TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256

TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA

TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA

TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA

TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256

TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA

TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA

TLS_DHE_RSA_WITH_AES_128_CBC_SHA256

TLS_DHE_RSA_WITH_AES_256_CBC_SHA256

TLS_DHE_RSA_WITH_AES_128_CBC_SHA

TLS_DHE_RSA_WITH_AES_256_CBC_SHA

TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA

TLS_RSA_WITH_AES_128_CBC_SHA256

TLS_RSA_WITH_AES_256_CBC_SHA256

TLS_RSA_WITH_AES_128_CBC_SHA

TLS_RSA_WITH_AES_256_CBC_SHA

SSL_RSA_WITH_3DES_EDE_CBC_SHA

 Screen shot of  the  Command Line using Putty to Show how the web -cs command is used

Figure 1. Screen shot of  the  Command Line using Putty to Show how the web -cs command is used

For NMC2 Cards Please  Follow FA359198 https://www.apc.com/us/en/faqs/FA359198/

Should there be any other questions, feel free to reach out to us at 800-800-4272 or our chat support group at APC by Schneider Electric Customer Technical Support

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