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The problem with explicitly specifying a cipher list is that you must manually add new ciphers as they come out. Instead, simply list the ciphers you want to remove, prepending the list (not each individual cipher) with a '-' character. So in this case, the Ciphers line should read:

Ciphers -arcfour*

Or if you prefer:

Ciphers -arcfour,arcfour128,arcfour256

From the sshd_config man page on the Ciphers option (since OpenSSH 7.5, released 2017-03-20):

If the specified value begins with a ‘+’ character, then the specified ciphers will be appended to the default set instead of replacing them. If the specified value begins with a ‘-’ character, then the specified ciphers (including wildcards) will be removed from the default set instead of replacing them.

This also applies to the KexAlgorithms and MACs options.

The problem with explicitly specifying a cipher list is that you must manually add new ciphers as they come out. Instead, simply list the ciphers you want to remove, prepending the list (not each individual cipher) with a '-' character. So in this case, the Ciphers line should read:

Ciphers -arcfour*

Or if you prefer:

Ciphers -arcfour,arcfour128,arcfour256

From the sshd_config man page on the Ciphers option (since OpenSSH 7.5, released 2017-03-20):

If the specified value begins with a ‘+’ character, then the specified ciphers will be appended to the default set instead of replacing them. If the specified value begins with a ‘-’ character, then the specified ciphers (including wildcards) will be removed from the default set instead of replacing them.

This also applies to the KexAlgorithms and MACs options.

The problem with explicitly specifying a cipher list is that you must manually add new ciphers as they come out. Instead, simply list the ciphers you want to remove, prepending the list (not each individual cipher) with a '-' character. So in this case, the Ciphers line should read:

Ciphers -arcfour*

Or if you prefer:

Ciphers -arcfour,arcfour128,arcfour256

From the sshd_config man page on the Ciphers option (since OpenSSH 7.0, released 2015-08-11):

If the specified value begins with a ‘+’ character, then the specified ciphers will be appended to the default set instead of replacing them. If the specified value begins with a ‘-’ character, then the specified ciphers (including wildcards) will be removed from the default set instead of replacing them.

This also applies to the KexAlgorithms and MACs options.

The problem with explicitly specifying a cipher list is that you must manually add new ciphers as they come out. Instead, simply list the ciphers you want to remove, prepending the list (not each individual cipher) with a '-' character. So in this case, the Ciphers line should read:

Ciphers -arcfour*

Or if you prefer:

Ciphers -arcfour,arcfour128,arcfour256

From the sshd_config man page on the Ciphers option (since OpenSSH 7.5, released 2017-03-20):

If the specified value begins with a ‘+’ character, then the specified ciphers will be appended to the default set instead of replacing them. If the specified value begins with a ‘-’ character, then the specified ciphers (including wildcards) will be removed from the default set instead of replacing them.

This also applies to the KexAlgorithms and MACs options.

The problem with explicitly specifying a cipher list is that you must manually add new ciphers as they come out. Instead, simply list the ciphers you want to remove, prepending the list (not each individual cipher) with a '-' character. So in this case, the Ciphers line should read:

Ciphers -arcfour*

Or if you prefer:

Ciphers -arcfour,arcfour128,arcfour256

From the sshd_config man page on the Ciphers option:

If the specified value begins with a ‘+’ character, then the specified ciphers will be appended to the default set instead of replacing them. If the specified value begins with a ‘-’ character, then the specified ciphers (including wildcards) will be removed from the default set instead of replacing them.

This also applies to the KexAlgorithms and MACs options.

The problem with explicitly specifying a cipher list is that you must manually add new ciphers as they come out. Instead, simply list the ciphers you want to remove, prepending the list (not each individual cipher) with a '-' character. So in this case, the Ciphers line should read:

Ciphers -arcfour*

Or if you prefer:

Ciphers -arcfour,arcfour128,arcfour256

From the sshd_config man page on the Ciphers option (since OpenSSH 7.0, released 2015-08-11):

If the specified value begins with a ‘+’ character, then the specified ciphers will be appended to the default set instead of replacing them. If the specified value begins with a ‘-’ character, then the specified ciphers (including wildcards) will be removed from the default set instead of replacing them.

This also applies to the KexAlgorithms and MACs options.