Description of Problem:
On a fresh 7.1 install, I chose the medium network security and a broadcast nis server. When the system booted, nis failed to function, because ipchains was blocking the replies from the nis server.
Steps to Reproduce:
1. have a functioning NIS system running elsewhere on the network
2. do a fresh install of RedHat 7.1 and choose medium firewall security and broadcast to find the NIS server
3. reboot and try to log in
login times out, even for root
I booted single user, disabled NIS, and then brought it up step by step manually till I found the problem.
Undoing the ipchains allows nis to work in this configuration. Since this machien is behind a firewall, I am not as worried about its security till I get around to fixing the ipchains rules.
NIS does not work with either medium or high firewall settings. See the release