CSF UI problems while coming from a proxy (EASY FIX PROPOSAL!)

feanorknd · Post by **feanorknd** » 20 Sep 2023, 15:36

Hi there,

when trying to access to UI from an nginx proxy, I have these weird error lines:

2023/09/20 15:43:20 [error] 2333492#2333492: *687017 upstream sent invalid header: "<!DOCTYPE\x20..." while reading response header from upstream

problem was located in line 9876 of lfd.pl:

Code: Select all

                                                print "HTTP/1.0 200 OK\r\n";
                                                print "<!DOCTYPE html>\n";
                                                print "Content-type: text/html\r\n";
                                                print "\r\n";
                                                print "<HTML>\n<TITLE>ConfigServer Security & Firewall</TITLE>\n<BODY style='font-family:Arial, Helvetica, sans-serif;' onload='document.getElementById(\"user\").focus()'>\n";

That 'print "<!DOCTYPE html>\n";' line should be added just before 'print "<HTML>'...

You are adding that line between HTTP headers, and this way, it will cause errors with strict upper layers...

Just comment that '<!DOCTYPE html>\n' line or place it just after 'print "\r\n";' line... this way it should be perfect!

Regards!!!

PD: congrats for your excellent work and tool.