The AX Serial Tunnel service does not initialize on a station startup:
Niagara R2 (revision 522 or above)
The tunnelAx jar is not installed in the host UNC.
The release notes for AX Tunneling in R2 do not clearly state to install the jar file in section 2.4 & 2.5 which provide install instructions.
However, section 1.2, indicates the requirement of this jar file.
Install the tunnelAx jar file prior to starting the install instructions in 2.4 & 2.5.