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First, make sure you've correctly installed the OnwardsDM patch from above; this is absolutely necessary for playing online.

Otherwise, this is usually due to HTTP traffic to the game being blocked by a firewall or antivirus software.

• In the case of firewalls and some AV software, the game may require an exception to be able to connect and play online.
• Some anti-virus software incorrectly blocks the server-listing traffic from the game with features such as HTTP filtering or "Link Scanning"
  • AVG Anti-Virus is particularly notorious for this, and may require re-installing AVG to fully disable the filtering.

In rare cases this can be caused by the online services being temporarily offline for maintenance.