Can ping the device but cannot SSH

What might be the possible problems when the switch I configured (S5735-L8T4X-A1) cannot be reached via SSH, but can be ping? 

How do I resolve this issue? I already configured the things needed for stelnet. 

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user-interface con 0

 authentication-mode aaa

user-interface vty 0

 authentication-mode aaa

user-interface vty 1 4

 authentication-mode aaa

 protocol inbound ssh

user-interface vty 16 20

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#

aaa

 authentication-scheme default

  authentication-mode local

 authentication-scheme radius

  authentication-mode radius

 authorization-scheme default

  authorization-mode local

 accounting-scheme default

  accounting-mode none

 local-aaa-user password policy administrator

  password history record number 0

  password expire 0

 domain default

  authentication-scheme radius

  accounting-scheme default

  radius-server default

 domain default_admin

  authentication-scheme default

  accounting-scheme default

 local-user admin privilege level 0

 local-user admin service-type terminal ssh

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