# Troubleshooting # ### CIRCLE admin page won’t load Maybe port 443 is closed. Check it and if it’s closed, open it. ### Some services aren’t functioning while running a second CIRCLE in a CIRCLE VM In this case the CIRCLE service agent could interfere with the *RabbitMQ* service. CIRCLE agent is not required for the newly installed CIRCLE. You should remove it with one of the following commads: If you have upstart: ```bash sudo rm -f /etc/init/agent.conf ``` Or if you have systemd: ```bash sudo rm -f /etc/systemd/system/agent.service ``` ### Home page of a node or a VM shows "No Data" instead of graphs Check if your hostname file contains fully qualified domain name instead of short host name: ```bash sudo nano /etc/hostname ``` If you see something similar to `cloud.example.com`, edit it so that only the part before the first period remains (e.g. `cloud`). Then set the host name accordingly: ```bash sudo hostname -F /etc/hostname ``` Then restart the monitor-client service. On Red Hat or Debian: ```bash sudo systemctl restart monitor-client.service ``` On Ubuntu 14.04: ```bash sudo service monitor-client restart ```