Got "Forbidden: Strict SSO Mode" after a fresh install

[daniel_splunk]

Once I did a fresh install and try to login to web GU, I got "Forbidden: Strict SSO Mode". I didn't enable any SSO at all.

I try this http://localhost:8089.en-US/debug/sso and it also confirmed sso is not enabled.

[daniel_splunk]

One possibility is you've firewall enabled on the sever.

You can try to run this command to verify.

iptables -t nat -L -v
iptables -t mangle -L -v
iptables -t raw -L -v
iptables -t security -L -v

From the output, if you saw something like this
"MASQUERADE all – any any anywhere anywhere"

This means you enabled masquerading for all traffic. This causes local to local traffic also to be source NATed.