Hi @MarcOliver,
OneCollect uses 7443 port if run in https mode(hosted) or port 8044 if run in http. In either case, you have the option to edit the configuration to change port to be used and is documented in user guide. Steps below.
http port 8044:
1. Stop OneCollect process.
2. Edit the CONFIG file located at <user home directory>\NetApp\OneCollect\Config\ and change entry for port
PORT = 8055 (or to desired port number).
3. Restart OneCollect process (or launch from shortcut). Access OneCollect with http://localhost:<new_port>
https port 7443:
1. Stop OneCollect process. Stop nginx process.
2. Edit nginx.conf located at <install directory>\NetApp\OneCollect\nginx\conf\.
3. When you find below section, replace the port for listen
server {
listen 7443;
4. Restart OneCollect process and access using https://localhost:<new_port> OR https://<system IP address>:<new_port>
Let us know if you have any other queries.