headlines with fancyhdr and documentclass scrreprt

Question

I am using documentclass scrrept and fancyheader headlines.

The problem is that on every page where a new chapter starts, here are no headers. Only the page no is shown in the middle of the footer. But I would like to have the header on each page.

\documentclass[12pt, bibliography=totoc]{scrreprt}

\usepackage{ngerman}
\usepackage[T1]{fontenc}
\usepackage[isolatin]{inputenc}

\usepackage{graphicx}
\usepackage[german]{varioref}
\usepackage{moreverb}

\usepackage{lastpage}
\usepackage{fancyhdr}



\renewcommand{\baselinestretch}{1.5}
\setlength{\oddsidemargin}{0.8cm}
\setlength{\evensidemargin}{0.8cm}
\setlength{\textwidth}{14cm}
\setlength{\textheight}{23cm}
\setlength{\topmargin}{-0.8cm}
\setlength{\parindent}{0pt}

\begin{document}



\pagestyle{fancy}

\renewcommand{\sectionmark}[1]{\markright{\thesection\ #1}}
\fancyhf{}
\fancyhead[LE,LO]{Thorsten Sohn, 1076041}

\fancyhead[CE,CO]{\thepage\ von \pageref{LastPage}}

Answer 1

You should set your document margins with package geometry or typearea! And also do not set the baselinestretch explicitely, use package setspace:

\documentclass[12pt, twoside]{scrreprt}
\usepackage[ngerman]{babel}
\usepackage[T1]{fontenc}
\usepackage[latin9]{inputenc}
\usepackage{graphicx}
\usepackage[german]{varioref}
\usepackage{moreverb}
\usepackage{lastpage,lipsum}
%----------------------------------------   
\usepackage[total={14cm,23cm},top=0.8cm,includehead]{geometry}
\usepackage{setspace}\onehalfspacing

\usepackage{fancyhdr}
\pagestyle{fancy}
\fancyhf{}
\fancyhead[LE,LO]{Thorsten Sohn, 1076041}
\fancyhead[CE,CO]{\thepage\ von \pageref{LastPage}}
\fancypagestyle{plain}{%
  \fancyhf{}
  \fancyhead[LE,LO]{Thorsten Sohn, 1076041}
  \fancyhead[CE,CO]{\thepage\ von \pageref{LastPage}}
}
%---------------------------------------- 
\renewcommand{\sectionmark}[1]{\markright{\thesection\ #1}}

\begin{document}
\chapter{first}
\lipsum[1-6]
\end{document}

Answer 2

At the begining of a new chapter the plain page style is used by default. If you want headers on chapter pages also, you may have to redefine the pagestyle plain.

\documentclass[12pt, bibliography=totoc]{scrreprt}
\usepackage{ngerman}
\usepackage[T1]{fontenc}
\usepackage[isolatin]{inputenc}
\usepackage{graphicx}
\usepackage[german]{varioref}
\usepackage{moreverb}
\usepackage{lastpage,lipsum}
\usepackage{fancyhdr}
%----------------------------------------   
\renewcommand{\baselinestretch}{1.5}
\setlength{\oddsidemargin}{0.8cm}
\setlength{\evensidemargin}{0.8cm}
\setlength{\textwidth}{14cm}
\setlength{\textheight}{23cm}
\setlength{\topmargin}{-0.8cm}
\setlength{\parindent}{0pt}
%---------------------------------------- 
\begin{document}
%---------------------------------------- 
%Redefine pagestyle {plain}
\fancypagestyle{plain}{%
  %% Clear all headers and footers
  \fancyhf{}
  \fancyhead[LE,LO]{Thorsten Sohn, 1076041}

\fancyhead[CE,CO]{\thepage\ von \pageref{LastPage}}
}
%---------------------------------------- 
\pagestyle{fancy}
\renewcommand{\sectionmark}[1]{\markright{\thesection\ #1}}
\fancyhf{}
\fancyhead[LE,LO]{Thorsten Sohn, 1076041}
\fancyhead[CE,CO]{\thepage\ von \pageref{LastPage}}
%---------------------------------------- 
\chapter{first}
\lipsum[1-6]
%---------------------------------------- 
\end{document}

Since you are using koma script, it is advisable to use scrpage2 to design headers and footers. This gives almost all the benefits of fancyhdr and more flexible for use.

\documentclass[12pt, bibliography=totoc,plainheadsepline,plainheadtopline]{scrreprt}
%------------------------------------------------
\usepackage{ngerman}
\usepackage[T1]{fontenc}
\usepackage[isolatin]{inputenc}
%------------------------------------------------
\usepackage{graphicx}
\usepackage[german]{varioref}
\usepackage{moreverb}
\usepackage{lastpage,lipsum}
\usepackage{scrpage2}%<-----here
%------------------------------------------------
\renewcommand{\baselinestretch}{1.5}
\setlength{\oddsidemargin}{0.8cm}
\setlength{\evensidemargin}{0.8cm}
\setlength{\textwidth}{14cm}
\setlength{\textheight}{23cm}
\setlength{\topmargin}{-0.8cm}
\setlength{\parindent}{0pt}
%------------------------------------------------
\begin{document}
%------------------------------------------------
%% Clear all headers and footers
\clearscrheadings
\clearscrplain
\clearscrheadfoot
%------------------------------------------------
\renewcommand{\sectionmark}[1]{\markright{\thesection\ #1}}
%------------------------------------------------
\cehead[\thepage\ von \pageref{LastPage}]{\thepage\ von \pageref{LastPage}}
\cohead[\thepage\ von \pageref{LastPage}]{\thepage\ von \pageref{LastPage}}
\lehead[Thorsten Sohn, 1076041]{Thorsten Sohn, 1076041}
\lohead[Thorsten Sohn, 1076041]{Thorsten Sohn, 1076041}
\setheadwidth[0pt]{head}
\setheadtopline{2pt}
\setheadsepline{.4pt}
%------------------------------------------------
\pagestyle{scrheadings}
%------------------------------------------------
\chapter{First chapter}
\section{First section}
\lipsum[1-6]
%------------------------------------------------
\end{document}

Please refer to scrguien.pdf page number 110 chapter 4 and sections 4.1 with 4.1.1 for more details.