1) Curl not operating properly. 2) Safe mode on 3) open_basedir restrictions in place. In other words. The host is blocking the use of php functions that dolphin requires.
Check host tools in admin for any reported hosting problems.
1) Curl not operating properly. 2) Safe mode on 3) open_basedir restrictions in place. (should be empty) 4) disable_functions set. (Also should be empty or at least not contain functions that dolphin requires.)