, the module should be detected in your version (minimum supported IOS is 12.3(8)T).Moreover I do not see any SLOT restriction about this module.
However I would like to know what is the exact reference of your module ? Is it HWIC-4ESW or HWIC-4ESW-POE ? Indeed for the last case (poe module) the router has to have a special power supply => (reference of the bundle is CISCO2801-AC-IP)
A. The Cisco 2800, 2900, 3800 and 3900series routers support optional field-replaceable power supplies that, along with the inline power modules (4- and 8-port modules: part numbers ILPM-4 and ILPM-8) provide the PoE function.
If the module is not POE, have you tried in another slot ? Is the module listed in the 'sh diag' (/ show inventory) ?
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
Q1: What are all the channel operational states from a BR (border role) perspective and what are the rules/conditions to be in each st...
The need was to reach an host inside a LAN through a VPN connection managed by the LAN gateway (Cisco 1921).
The LAN gateway performs NAT and there was a dedicate nat rule for the host i wanted to reach through VPN.
I couldn't connect to the hos...