The Tmux config that works on my server (some things commented out currently)

.tmux.conf

set -g prefix C-a
unbind C-b
bind C-a send-prefix

set -sg escape-time 1

set -g base-index 1
# setw -g pane-base-index 1

bind r source-file ~/.tmux.conf \; display "Reloaded!"

bind | split-window -h
bind - split-window -v

bind -r h select-pane -L
bind -r j select-pane -D
bind -r k select-pane -U
bind -r l select-pane -R

bind -r C-h select-window -t :-
bind -r C-l select-window -t :+

bind -r H resize-pane -L 5
bind -r J resize-pane -D 5
bind -r K resize-pane -U 5
bind -r L resize-pane -R 5

setw -g mode-mouse on

# set -g mouse-select-pane on
# set -g mouse-resize-pane on
# set -g mouse-select-window on