We have the same issue and believe it is due to the ISE using the system proxy settings. According to the documentation, it should be possible to add exceptions, but I don't see these fields (ISE 1.2 patch 4) Step 1 Choose Administration > System > Settings > Proxy. Step 2 Enter the proxy IP address or DNS-resolvable host name in Proxy Address, and specify the port through which proxy traffic travels to and from Cisco ISE in Proxy Port. Step 3 Enter the IP Address or Address range of hosts or domains to be bypassed in Bypass Proxy Settings for these Hosts & Domain. Step 4 Enter the username and password used to authenticate to the proxy servers in the corresponding fields. Step 5 Click Save.
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