Why does 'localhost' work and IP 127.0.0.1 not?

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Dear Responders,

When calling the transaction that requires a webUI (e.g. solman_setup), I need to change the called url from my alias to 'localhost'. Otherwise, the login is displayed, but not executed. After login in the webrowser creates a 'Error 404: missing page'. So I tried to vary the url and found out something strange: using the FQDN results in the same deadlock as the alias. And 127.0.0.1 too.

So, why does 'localhost' the alias of 127.0.0.1 work and the actual IP adress not?

And why I have to change the url anway?

We use http, https-switching is off, but swichting it on haven't improved the situation. The alias is registered in the httpurlloc table and is the same as the sapglobalhost and saplocalhost in our instance profile.

Best regards,

Jakob