explain which arguments the option "server" accepts

[Karl-Philipp Richter]

An URL, a hostname, etc.?

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ddclient 3.8.2-2ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-30.33-generic 3.19.8-ckt6
Uname: Linux 3.19.0-30-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl fglrx
ApportVersion: 2.17.2-0ubuntu1.5
Architecture: amd64
Date: Sat Oct 10 09:26:04 2015
InstallationDate: Installed on 2015-04-20 (172 days ago)
InstallationMedia: Ubuntu-Server 14.10 "Utopic Unicorn" - Release amd64 (20141022.2)
PackageArchitecture: all
ProcEnviron:
 TERM=screen
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: ddclient
UpgradeStatus: Upgraded to vivid on 2015-04-24 (168 days ago)