What ports are blocked on Sparklight's high-speed internet service?

Sparklight reserves the right to employ network management practices (e.g., to prevent the distribution of viruses or other malicious code) as well as to block the transfer of unlawful content. As such, Sparklight blocks ports 135, 136, 137, 138, 139 & 445. In addition, SMTP Port 25 and SSDP Port 1900 are restricted for residential customers. Our technical support agents are unable to unblock these ports. 

Note: For additional information on Sparklight's Network Management Information, please click here.