title: Error: Unable to establish IPMI v2 / RMCP+ session
body: <p>I installed the <code>ipmitool 1.8.18</code> in the CentOS7.2 Dedicated Server, I can use it for check self own ipmi data: </p>
  
  <pre><code># ipmitool -I open power status
  Chassis Power is on
  </code></pre>
  
  <p>but I want to check other ipmi address' status, I will get this error:</p>
  
  <pre><code># ipmitool -H 172.16.22.237  -U root -P mypassword  -I lanplus chassis status -v
  Get Auth Capabilities error
  Error issuing Get Channel Authentication Capabilities request
  Error: Unable to establish IPMI v2 / RMCP+ session
  </code></pre>
  
  <hr>
  
  <p>in the being controlled Server I use ipmitool checked the <code>lan</code>:</p>
  
  <pre><code>[root@localhost ~]# ipmitool -I open lan print 1
  Set in Progress         : Set Complete
  Auth Type Support       : NONE MD2 MD5 PASSWORD 
  Auth Type Enable        : Callback : MD2 MD5 PASSWORD 
                          : User     : MD2 MD5 PASSWORD 
                          : Operator : MD2 MD5 PASSWORD 
                          : Admin    : MD2 MD5 PASSWORD 
                          : OEM      : MD2 MD5 PASSWORD 
  IP Address Source       : Static Address
  IP Address              : 172.16.22.237
  Subnet Mask             : 255.255.255.0
  MAC Address             : 00:25:90:a9:42:4a
  SNMP Community String   : public
  IP Header               : TTL=0x00 Flags=0x00 Precedence=0x00 TOS=0x00
  BMC ARP Control         : ARP Responses Enabled, Gratuitous ARP Disabled
  Default Gateway IP      : 0.0.0.0
  Default Gateway MAC     : 00:00:00:00:00:00
  Backup Gateway IP       : 0.0.0.0
  Backup Gateway MAC      : 00:00:00:00:00:00
  802.1q VLAN ID          : Disabled
  802.1q VLAN Priority    : 0
  RMCP+ Cipher Suites     : 1,2,3,6,7,8,11,12
  Cipher Suite Priv Max   : aaaaXXaaaXXaaXX
                          :     X=Cipher Suite Unused
                          :     c=CALLBACK
                          :     u=USER
                          :     o=OPERATOR
                          :     a=ADMIN
                          :     O=OEM
  Bad Password Threshold  : Not Available
  </code></pre>
  
  <hr>
  
  <p><strong>EDIT-01</strong></p>
  
  <p>I use <code>nmap</code> get bellow information:</p>
  
  <pre><code># nmap -p 623 -sU -P0 172.16.22.237 
  
  Starting Nmap 6.40 ( http://nmap.org ) at 2018-08-22 08:01 CST
  Nmap scan report for 172.16.22.237
  Host is up.
  PORT    STATE         SERVICE
  623/udp open|filtered asf-rmcp
  
  Nmap done: 1 IP address (1 host up) scanned in 2.11 seconds
  </code></pre>