After the update to Mac OS X 10.9, and in particulate 10.9.2, many Citrix users loose their connection after 1-5 min.
To fix the issue, open the terminal and type in the following:
echo net.link.ether.inet.arp_unicast_lim=0 >> /etc/sysctl.conf
chown root:wheel /etc/sysctl.conf
chmod 0644 /etc/sysctl.conf
Reboot the computer.
For more info about the cause of this, read this blog from Citrix: