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All of my shapefiles have exactly the same WKT.
Using http://prj2epsg.org I have verified that EPSG:3059 has the same parameters as WKT definition of my shapefiles, so I'm using 3059 in my mapfile.

I want to know what changes I must make in my mapfile for my WMS service to work.

What I have tried:

 - I thought maybe epsg:3059 is not supported by my mapserver version 6.0.3. I checked file C:\MS4W\ms4w\proj\nad\epsg and 3059 is listed there. Still, I tried to convert the shapefile to different epsg, for example, 4326 and 3857. No success. I also tried setting up the newest stable Mapserver version 6.4.1. No success.

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When I send GetCapabilities request...  

    http://localhost:1025/cgi-bin/mapserv.exe
    ?map=C:\MS4W\ms4w\Apache\htdocs\gis\mapfile2.map
    &SERVICE=WMS&VERSION=1.1.1%20
    &REQUEST=GetCapabilities

I get a response XML document with no errors and warnings.

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When I send a GetMap request...

    http://localhost:1025/cgi-bin/mapserv.exe
    ?map=C:\MS4W\ms4w\Apache\htdocs\gis\mapfile2.map
    &SERVICE=WMS
    &VERSION=1.1.1%20
    &STYLES=
    &REQUEST=GetMap
    &LAYERS=lat_rob_region
    &SRS=EPSG:3059%20
    &BBOX=313187.4,146161.56,766469.92,470367.64
    &WIDTH=800
    &HEIGHT=600%20
    &FORMAT=image/png

I get this message as response:

...  
**msWMSLoadGetMapParams(): WMS server error. Invalid SRS given : SRS must be valid for all requested layers.**  
...

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If I access mapfile via browser, I can see the layer displayed correctly:

    http://localhost:1025/cgi-bin/mapserv.exe?map=C:\MS4W\ms4w\Apache\htdocs\gis\mapfile2.map&layer=lat_rob_region

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**mapfile2.map**:

    MAP
    
        CONFIG "MS_ERRORFILE" "C:/MS4W/ms4w/Apache/htdocs/gis/tmp/log.txt"
        DEBUG 5
        NAME map
        STATUS ON
        SIZE 800 500
        EXTENT 313187.4 146161.56 766469.92 470367.64
        UNITS METERS
        SHAPEPATH "shapefiles3"
        IMAGECOLOR 155 155 155
     
        WEB
            TEMPLATE "MapServerCGI.html"
            IMAGEPATH "C:/MS4W/ms4w/Apache/htdocs/gis/output/"
            IMAGEURL "/gis/output/"
            
            METADATA
                "wms_title"             "MapServer Openlayers testa aplikacija"
                "wms_onlineresource"    "http://localhost:1025/cgi-bin/mapserv.exe?map=C:\MS4W/ms4w/Apache/htdocs/gis/mapfile2.map"
                "wms_enable_request"    "*"
                "wms_srs"               "EPSG:3059"
                
            END
        END
    
        PROJECTION
            "init=epsg:3059"
        END
        
    # lat_rob_region
        LAYER
            METADATA
                "wms_title"           "lat_rob_region"
                "wms_srs"             "EPSG:3059"
            END
            NAME "lat_rob_region"
            DATA lat_rob_region
            STATUS ON
            TYPE POLYGON
            CLASS
                NAME "lat_rob_region"
                STYLE
                    COLOR 0 255 0
                END
            END
        END
    
    END


----------

**WKT definition:**

    PROJCS["GRS_1980_Transverse_Mercator",
    GEOGCS["GCS_GRS_1980",
    DATUM["D_GRS_1980",
    SPHEROID["GRS_1980",6378137,298.257222101]],
    PRIMEM["Greenwich",0],
    UNIT["Degree",0.017453292519943295]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["False_Easting",500000],
    PARAMETER["False_Northing",-6000000],
    PARAMETER["Central_Meridian",24],
    PARAMETER["Scale_Factor",0.9996],
    PARAMETER["Latitude_Of_Origin",0],
    UNIT["Meter",1]]


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**GetCapabilities.xml** looks like this:

    <?xml version='1.0' encoding="ISO-8859-1" standalone="no" ?>
    <!DOCTYPE WMT_MS_Capabilities SYSTEM "http://schemas.opengis.net/wms/1.1.1/WMS_MS_Capabilities.dtd"
     [
     <!ELEMENT VendorSpecificCapabilities EMPTY>
     ]>  <!-- end of DOCTYPE declaration -->
    
    <WMT_MS_Capabilities version="1.1.1">
    
    <!-- MapServer version 6.0.3 (MS4W 3.0.6) OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG OUTPUT=KML SUPPORTS=PROJ SUPPORTS=AGG SUPPORTS=CAIRO SUPPORTS=FREETYPE SUPPORTS=ICONV SUPPORTS=FRIBIDI SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER SUPPORTS=SOS_SERVER SUPPORTS=FASTCGI SUPPORTS=THREADS SUPPORTS=GEOS INPUT=JPEG INPUT=POSTGIS INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE -->
    
    <Service>
      <Name>OGC:WMS</Name>
      <Title>MapServer Openlayers testa aplikacija</Title>
      <OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://localhost:1025/cgi-bin/mapserv.exe?map=C:\MS4W/ms4w/Apache/htdocs/gis/mapfile2.map&amp;"/>
      <ContactInformation>
      </ContactInformation>
    </Service>
    
    <Capability>
      <Request>
        <GetCapabilities>
          <Format>application/vnd.ogc.wms_xml</Format>
          <DCPType>
            <HTTP>
              <Get><OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://localhost:1025/cgi-bin/mapserv.exe?map=C:\MS4W/ms4w/Apache/htdocs/gis/mapfile2.map&amp;"/></Get>
              <Post><OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://localhost:1025/cgi-bin/mapserv.exe?map=C:\MS4W/ms4w/Apache/htdocs/gis/mapfile2.map&amp;"/></Post>
            </HTTP>
          </DCPType>
        </GetCapabilities>
        <GetMap>
          <Format>image/png</Format>
          <Format>image/jpeg</Format>
          <Format>image/gif</Format>
          <Format>image/png; mode=8bit</Format>
          <Format>application/x-pdf</Format>
          <Format>image/svg+xml</Format>
          <Format>image/tiff</Format>
          <Format>application/vnd.google-earth.kml+xml</Format>
          <Format>application/vnd.google-earth.kmz</Format>
          <DCPType>
            <HTTP>
              <Get><OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://localhost:1025/cgi-bin/mapserv.exe?map=C:\MS4W/ms4w/Apache/htdocs/gis/mapfile2.map&amp;"/></Get>
              <Post><OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://localhost:1025/cgi-bin/mapserv.exe?map=C:\MS4W/ms4w/Apache/htdocs/gis/mapfile2.map&amp;"/></Post>
            </HTTP>
          </DCPType>
        </GetMap>
        <GetFeatureInfo>
          <Format>text/plain</Format>
          <Format>application/vnd.ogc.gml</Format>
          <DCPType>
            <HTTP>
              <Get><OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://localhost:1025/cgi-bin/mapserv.exe?map=C:\MS4W/ms4w/Apache/htdocs/gis/mapfile2.map&amp;"/></Get>
              <Post><OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://localhost:1025/cgi-bin/mapserv.exe?map=C:\MS4W/ms4w/Apache/htdocs/gis/mapfile2.map&amp;"/></Post>
            </HTTP>
          </DCPType>
        </GetFeatureInfo>
        <DescribeLayer>
          <Format>text/xml</Format>
          <DCPType>
            <HTTP>
              <Get><OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://localhost:1025/cgi-bin/mapserv.exe?map=C:\MS4W/ms4w/Apache/htdocs/gis/mapfile2.map&amp;"/></Get>
              <Post><OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://localhost:1025/cgi-bin/mapserv.exe?map=C:\MS4W/ms4w/Apache/htdocs/gis/mapfile2.map&amp;"/></Post>
            </HTTP>
          </DCPType>
        </DescribeLayer>
        <GetLegendGraphic>
          <Format>image/png</Format>
          <Format>image/jpeg</Format>
          <Format>image/gif</Format>
          <Format>image/png; mode=8bit</Format>
          <DCPType>
            <HTTP>
              <Get><OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://localhost:1025/cgi-bin/mapserv.exe?map=C:\MS4W/ms4w/Apache/htdocs/gis/mapfile2.map&amp;"/></Get>
              <Post><OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://localhost:1025/cgi-bin/mapserv.exe?map=C:\MS4W/ms4w/Apache/htdocs/gis/mapfile2.map&amp;"/></Post>
            </HTTP>
          </DCPType>
        </GetLegendGraphic>
        <GetStyles>
          <Format>text/xml</Format>
          <DCPType>
            <HTTP>
              <Get><OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://localhost:1025/cgi-bin/mapserv.exe?map=C:\MS4W/ms4w/Apache/htdocs/gis/mapfile2.map&amp;"/></Get>
              <Post><OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://localhost:1025/cgi-bin/mapserv.exe?map=C:\MS4W/ms4w/Apache/htdocs/gis/mapfile2.map&amp;"/></Post>
            </HTTP>
          </DCPType>
        </GetStyles>
      </Request>
      <Exception>
        <Format>application/vnd.ogc.se_xml</Format>
        <Format>application/vnd.ogc.se_inimage</Format>
        <Format>application/vnd.ogc.se_blank</Format>
      </Exception>
      <VendorSpecificCapabilities />
      <UserDefinedSymbolization SupportSLD="1" UserLayer="0" UserStyle="1" RemoteWFS="0"/>
      <Layer>
        <Name>karte</Name>
        <Title>MapServer Openlayers testa aplikacija</Title>
        <Abstract>karte</Abstract>
        <SRS>EPSG:3059</SRS>
        <LatLonBoundingBox minx="20.809" miny="55.3892" maxx="28.5475" maxy="58.3742" />
        <BoundingBox SRS="EPSG:3059"
                    minx="313187" miny="146162" maxx="766470" maxy="470368" />
        <Layer queryable="0" opaque="0" cascaded="0">
            <Name>lat_rob_region</Name>
            <Title>lat_rob_region</Title>
            <SRS>EPSG:3059</SRS>
            <LatLonBoundingBox minx="20.829" miny="55.6313" maxx="28.4458" maxy="58.0913" />
            <BoundingBox SRS="EPSG:3059"
                        minx="312878" miny="172940" maxx="762571" maxy="438874" />
            <Style>
              <Name>default</Name>
              <Title>default</Title>
              <LegendURL width="119" height="21">
                 <Format>image/png</Format>
                 <OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple" xlink:href="http://localhost:1025/cgi-bin/mapserv.exe?map=C:\MS4W/ms4w/Apache/htdocs/gis/mapfile2.map&amp;version=1.1.1&amp;service=WMS&amp;request=GetLegendGraphic&amp;layer=lat_rob_region&amp;format=image/png&amp;STYLE=default"/>
              </LegendURL>
            </Style>
        </Layer>
      </Layer>
    </Capability>
    </WMT_MS_Capabilities>