Since the identd in mIRC was working before and only stopped after you updated your system, this means that something on your system has changed and is now blocking the identd in mIRC.
You will need to check your anti-virus and firewall settings.
If the UPnP identd option is enabled in mIRC, you will need to make sure that UPnP is working correctly on your system.
If you are not using UPnP, you will need to make sure that your router is correctly configured to allow incoming connections on port 113 and that your anti-virus and firewall software are also allowing those connections.
