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Ports for Speedtest (perfSonar + NDT)

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Have setup firewall rules as per https://www.domotz.com/ufaqs/need-configure-firewall/?Display_FAQ=10820


However speedtest fails repeatedly saying 'Cannot find an available server'.


I understand that speedtest does not always work but I have tried and then waited etc and never connects.


Please can you tell me whether additional firewall ports need to be opened for the speedtest to work? Alternatively which logfile to I need to look at or forward to you and how do I PM it across?


Thanks in advance

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