kengoman has commented on the following diary entries

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Failed on Downloading Data in JOSM over 1 year ago

This usually happens when you download too large of an area or amount of objects. There’s a setting for the time out timing in JOSM which you can increase to prevent this from happening.

Go to Preferences->Advanced Preferences search for “timeout” and change socket.timeout.connect and to a higher value (something like 150 and 300 for them) You might need to check the box “expert mode” to see Advanced Preferences

Hope this helps, Kengoman