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Created attachment 1265333 [details]
screenshot

Description of problem:
selinux is preventing masking of iptables.
It's useful to mask iptables. Issues arise from starting iptables when firewalld is active.

Version-Release number of selected component (if applicable):
7.3.1611

How reproducible:
All instances I tried reproduced it.

Steps to Reproduce:
1. Update CentOS to latest (7.3.1611)
2. run systemctl mask iptables
3. 

Actual results:
Iptables service is not masked, you get "Failed to execute operation: Access denied"

Expected results:
Iptables service should be masked, you should get "Created symlink from /etc/systemd/system/iptables.service to /dev/null"

Additional info:
Other services could be masked without issues(example network.service, postfix.service, rhnsd.service). Putting SELINUX in permissive mode allows masking of iptables.

I believe this bug is a duplicate of BZ#1337041.

(In reply to Milos Malik from comment #2)
> I believe this bug is a duplicate of BZ#1337041.

Yep.  Same problem which is why I listed it as related.  It's affecting 7.3 and that bug doesn't list 7.3.  If there's anything I can provide from logs, etc... to help, let me know...

Best Regards,
Akmal Avloni

*** This bug has been marked as a duplicate of bug 1337041 ***