Node durian.iotasalad.org is offline. See here to check and find a node from iotasalad.org that is online and completely synchronized. I prefer patato.iotasalad, it works for me.

Rather, I recommend to use the node list from iota.dance to find a good node. I have never had any connection problems by choosing a node from the list with a good number of neighbors, current milestone and less load.