I'm able to remotely communicate with a server's BMC with the following command when the default "all zeros" are entered into the Encryption Key configuration.

sudo ipmitool -I lanplus -H -U chassis power status

Yet I get the following error when I use an encryption/kg key symetric pair:

sudo ipmitool -I lanplus -H -U -k -vv chassis power status

[...]<

<< Message tag : 0x00
<< RMCP+ status : no errors
<< Console Session ID : 0xa0a2a3a4
<< Key exchange auth code [sha1] : 0xfb46be9ddfb39ac778608f79

> RAKP 4 message has invalid integrity check value
Error: Unable to establish IPMI v2 / RMCP+ session
Running Get PICMG Properties my_addr 0x20, transit 0, target 0x20
No Response from Get PICMG Properties
No PICMG Extenstion discovered
Interface address: my_addr 0x20 transit 0:0 target 0x20:0 ipmb_target 0

Unable to get Chassis Power Status

Using the Dell Troubleshooting Tool, I get "Connection Passed" when the encryption/KG Key is typed in.

Any suggestions as what I can try next?