It seems to be saying it doesn't support your version.
First fetch the getcapabilites document - which seems to indicate it should support version=1.1.1
<?xml version='1.0' encoding="UTF-8"?>
<!DOCTYPE WMT_MS_Capabilities SYSTEM "http://85.18.173.22:8080/DbMAP_WMS/capabilities_1_1_1.dtd" [<!ELEMENT VendorSpecificCapabilities EMPTY>]>
<WMT_MS_Capabilities version="1.1.1" updateSequence="1491294758094">
<Service>
<Name>OGC:WMS</Name>
<Title>DbMAP WMS</Title>
<Abstract>DbMAP WMS by ABACO S.p.A. (www.abacogroup.com)</Abstract>
<OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple" xlink:href="http://www.abacogroup.com/"/>
</Service>
<Capability>
<Request>
<GetCapabilities>
<Format>application/vnd.ogc.wms_xml</Format>
<DCPType>
<HTTP>
<Get>
<OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple" xlink:href="http://85.18.173.22:8080/DbMAP_WMS/ORTOFOTO_2011/WMSservlet?" />
</Get>
<Post>
<OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple" xlink:href="http://85.18.173.22:8080/DbMAP_WMS/ORTOFOTO_2011/WMSservlet?" />
</Post>
</HTTP>
</DCPType>
</GetCapabilities>
<GetMap>
<Format>image/gif</Format>
<Format>image/png</Format>
<Format>image/jpeg</Format>
<Format>image/bmp</Format>
<Format>image/svg+xml</Format>
<DCPType>
<HTTP>
<Get>
<OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple" xlink:href="http://85.18.173.22:8080/DbMAP_WMS/ORTOFOTO_2011/WMSservlet?" />
</Get>
</HTTP>
</DCPType>
</GetMap>
<GetFeatureInfo>
<Format>text/html</Format>
<DCPType>
<HTTP>
<Get>
<OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple" xlink:href="http://85.18.173.22:8080/DbMAP_WMS/ORTOFOTO_2011/WMSservlet?" />
</Get>
</HTTP>
</DCPType>
<Format>text/xml</Format>
</GetFeatureInfo>
</Request>
<Exception>
<Format>application/vnd.ogc.se_xml</Format>
</Exception>
<Layer>
<Name>_Main_Layer_</Name>
<Title>Main Layer</Title>
<SRS>EPSG:3004</SRS>
<LatLonBoundingBox minx="-180" miny="-90" maxx="180" maxy="90"/>
<BoundingBox SRS="EPSG:3004" minx="2249990.0" miny="4594199.0" maxx="2378813.75" maxy="4681672.0"/>
<Layer>
<Name>Egeos 2011</Name>
<Title>Egeos 2011</Title>
<BoundingBox SRS="EPSG:3004" minx="2249990.0" miny="4594199.0" maxx="2378813.75" maxy="4681672.0"/>
</Layer>
</Layer>
</Capability>
</WMT_MS_Capabilities>
So next you need to check your layer name (Egeos 2011), format (image/png) and SRS (3003
) and only epsg:3004
is supported which is probably the problem.
Though the fact the server lies about it's lat/lon bounds may also cause a problem, if there were any contact details I'd complain to the owner.