Have internal web apps and Nfuse available to remote users after they authenticate to our firewall using a ACS account. All was cool until we recently upgraded our FWSM and IOS image. Now some users are complaining that they do not get an authentication prompt from the firewall and cannot login. Most users can authenticate as usual.
Weird thing is that if the end user takes their home router or firewall out of the mix, the firewall authentication works. In some cases, an upgrade of the remote router or firewall firmware resolves the issue as well.
Any reason why the FWSM would start acting this way and not allow connections from devices that could connect previously? NAT issue? I don't want to have to upgrade firmware on users personal routers and firewalls to make this work...
