Copy the Server2_isight.cer file from Server2 to the following directory on Server1:
<Weblogic_install_directory>\wlserver_12.1\server\lib
Navigate to the following directory:
<Weblogic_install_directory>\user_projects\domains\<SEE_Domain>\bin
Run the following command:
setDomainEnv.cmd
Navigate to the following directory:
<Weblogic_install_directory>\wlserver_12.1\server\lib
Import Server2's certificate into Server1's trust store by running the following command:
keytool -import -v -trustcacerts -alias server2_cert_isight -file Server2_isight.cer -keystore securedcacerts -storepass isightb2b
Repeat steps 1 through 5 for each server (replace Server1 with Server2).