Hi, I tried to have ArcServer create a wms for me to use in OpenLayers but it just shows up in the right place but as a pink tile. 
I checked the capabilities and it looks like it should work.

my code:
        //http://www.snydercountygis.org:6080/arcgis/services/bwaBndy/MapServer/WMSServer?request=GetCapabilities&service=WMS
                        var layer1 = new OpenLayers.Layer.WMS('Boundary, Municipality',
            'http://www.snydercountygis.org:6080/arcgis/services/bwaBndy/MapServer/WMSServer?',
            {layers: 'Watershed , Municipality',TRANSPARENT:true, format: "image/png",crs:'EPSG:3857'    
                         },   //version: '1.3.0' //,crs:'EPSG:3857'     
                        
                        {singleTile: true, transparent: true, isBaseLayer: true, opacity: 0.75, projection:'EPSG:3857'}
                        );

Any ideas, clues?  Thx..

        
        
        
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