<binding name="PayrollReportsSoapBinding1" closeTimeout="00:01:00"
     openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
     allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
     maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
     messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
     useDefaultWebProxy="true">
     <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
      maxBytesPerRead="4096" maxNameTableCharCount="16384" />
     <security mode="TransportWithMessageCredential">      
      <message clientCredentialType="UserName" />
     </security>
    </binding>

LemLocal.PayrollReportsPortTypeClient servClass = new LemLocal.PayrollReportsPortTypeClient("PayrollReportsSoap1");

            ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(IgnoreCertificateErrorHandler);

            servClass.ClientCredentials.UserName.UserName = "Andrey";
            servClass.ClientCredentials.UserName.Password = "";

            string sXml = servClass.GetPersonOrganizations(sPersId);

.
.
.
public static bool IgnoreCertificateErrorHandler(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
    {
        return true;
    }

<binding name="PayrollReportsSoap12Binding">
     <textMessageEncoding maxReadPoolSize="64" maxWritePoolSize="16"
      messageVersion="Soap12" writeEncoding="utf-8">
      <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
       maxBytesPerRead="4096" maxNameTableCharCount="16384" />
     </textMessageEncoding>
     <httpTransport manualAddressing="false" maxBufferPoolSize="524288"
      maxReceivedMessageSize="65536" allowCookies="false" authenticationScheme="Basic"
      bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
      keepAliveEnabled="true" maxBufferSize="65536" proxyAuthenticationScheme="Basic"
      realm="" transferMode="Buffered" unsafeConnectionNtlmAuthentication="false"
      useDefaultWebProxy="true">
      <extendedProtectionPolicy policyEnforcement="Never" />
     </httpTransport>
    </binding>