Open your Dimecoin wallet console from: Help - Debug. Write:

addnode 41.78.77.178 add
addnode 108.53.178.39 add
addnode 115.28.16.229 add
addnode 109.65.166.87 add
addnode 99.99.203.102 add
addnode 86.184.213.156 add
addnode 115.28.16.229 add
addnode 115.28.11.226 add

If that wont help, try "onetry" some of the nodes above. (addnode 99.99.203.102 onetry)