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Avoid firewall conflicts#

Avoid firewall conflicts in the following Linux distributions:

Linux distribution Procedure
SUSE Linux Enterprise Server 12 SP2 Installations have the FW_LO_NOTRACK flag turned on by default in the openSUSE firewall. It speeds up packet processing on the loopback interface but breaks certain firewall setups that redirect outgoing packets via custom rules on the local machine.

To turn off the FW_LO_NOTRACK option:
  1. In /etc/sysconfig/SuSEfirewall2, set FW_LO_NOTRACK="no".
  2. Either restart the firewall or reboot the system.
SUSE Linux Enterprise Server 12 SP3 No change is required, as installations have the FW_LO_NOTRACK flag turned off by default.