As stated by the Z8games FAQs
If you are unable to connect to the server, it could mean that your internet connection is unstable, Crossfire servers are currently down, the servers are too busy (especially if you receive a fail to connect error) or you need to change your fire wall settings to allow Crossfire to run. Keep trying to connect a few more times; you will be connected if everything else is okay.
1. If it is your Internets stability you will receive lag while browsing websites as well, If this is occurring to you, Please contact your Internet Service Provider.
2. You can check all servers activity here;
Crossfire Server status!
3. Please add Crossfire to your Anti-Virus Programs Exceptions list.
- Another reason may be certain programs are conflicting with Crossfire's ability to run normally, Please turn off all unneeded programs manually or by using SmartClose;
SmartClose download and reviews from SnapFiles
- Next, you may need to run a virus scan on your computer as some malicious files can cause problems running the game properly;
AVG;
AVG Free | Antivirus Download | Free Virus Protection
Good luck
If you need anything more please contact me.