ServU15.3 not reading login banner, also "New client" does not use css

Hello egberto.zanon, I also experiencing the same issue as you are having with the HTTP Login Page Text. 

I also notice another bug where  Domain Url that was set in File Sharing Settings  was not propagating correctly to various sub domains. What will happen is a user sends out a file upload request link and the imbedded link will  be the correct domain url. But after a file gets uploaded to that file upload request link the notification email of "A file has been uploaded to share" will contain the wrong Domain Url. But the odd fix to that was I simply had to delete the domain url from file sharing settings and re type it in and click save. But to the issue you have stated with the HTTP Login Page Text I am still looking for a solution as well.

I had reported the same finding (no logo/web branding in the new web client) during my initial evaluation and even created a ticket with SolarWinds, sadly 3-4 weeks later I got a call and a response that, the logo "feature" was not in their new product / web client and that I should create a "feature" request in hopes of having it re-added sometime in the future.

Case # - 00993095 New Web Client Branding

I have submitted this feature request to our development team as requested as the functionality that you require is currently not in our product. 

We value your opinion as a customer and without you we wouldn’t have such strong features in our products. The development teams look very closely at each one to determine viability and will decide on the timeline of the release (if they decide to implement the feature). We cannot deliver timeframes or release dates for all feature requests.

SolarWinds Technical Support

How this previously "core" and still accessible section suddenly became something that isn't in the product and we now have to try to convince Solarwinds to put it back into their new product is beyond me.

There is an existing "feature" request open to get Solarwinds to put this back in, please go vote !

https://thwack.solarwinds.com/product-forums/serv-u-ftp-mft/i/feature-requests/feature-to-customize-color-theme-logo-the-new-web-client

Good old Solarwinds...  if this is not a feature in this version of the product maybe that should of been mention before upgrading to 15.3 or maybe in 15.3 remove settings for these options to be configured.