diff --git a/dnsforward/dnsforward.go b/dnsforward/dnsforward.go
index df4f4d68..9f2ddd0d 100644
--- a/dnsforward/dnsforward.go
+++ b/dnsforward/dnsforward.go
@@ -7,6 +7,8 @@ import (
 	"sync"
 	"time"
 
+	"github.com/pkg/errors"
+
 	"github.com/AdguardTeam/dnsproxy/upstream"
 
 	"github.com/AdguardTeam/dnsproxy/proxy"
@@ -97,21 +99,19 @@ func (s *Server) startInternal(config *ServerConfig) error {
 		s.ServerConfig = *config
 	}
 
-	if s.dnsFilter == nil {
-		log.Printf("Creating dnsfilter")
-		s.dnsFilter = dnsfilter.New(&s.Config)
-		// add rules only if they are enabled
-		if s.FilteringEnabled {
-			// TODO: Handle error
-			s.dnsFilter.AddRules(s.Filters)
-		}
+	if s.dnsFilter != nil || s.dnsProxy != nil {
+		return errors.New("DNS server is already started")
+	}
+
+	err := s.initDNSFilter()
+	if err != nil {
+		return err
 	}
 
 	log.Printf("Loading stats from querylog")
-	err := fillStatsFromQueryLog()
+	err = fillStatsFromQueryLog()
 	if err != nil {
-		log.Printf("Failed to load stats from querylog: %s", err)
-		return err
+		return errorx.Decorate(err, "failed to load stats from querylog")
 	}
 
 	once.Do(func() {
@@ -139,12 +139,23 @@ func (s *Server) startInternal(config *ServerConfig) error {
 		proxyConfig.Upstreams = defaultValues.Upstreams
 	}
 
-	// TODO: Don't let call Start the second time
-	// Initialize the DNS proxy
+	// Initialize and start the DNS proxy
 	s.dnsProxy = &proxy.Proxy{Config: proxyConfig}
+	return s.dnsProxy.Start()
+}
 
-	err = s.dnsProxy.Start()
-	return err
+// Initializes the DNS filter
+func (s *Server) initDNSFilter() error {
+	log.Printf("Creating dnsfilter")
+	s.dnsFilter = dnsfilter.New(&s.Config)
+	// add rules only if they are enabled
+	if s.FilteringEnabled {
+		err := s.dnsFilter.AddRules(s.Filters)
+		if err != nil {
+			return errorx.Decorate(err, "could not initialize dnsfilter")
+		}
+	}
+	return nil
 }
 
 // Stop stops the DNS server
diff --git a/dnsforward/querylog.go b/dnsforward/querylog.go
index 82c06f6a..7058a3b9 100644
--- a/dnsforward/querylog.go
+++ b/dnsforward/querylog.go
@@ -3,7 +3,6 @@ package dnsforward
 import (
 	"encoding/json"
 	"fmt"
-	"log"
 	"net/http"
 	"strconv"
 	"strings"
@@ -12,6 +11,7 @@ import (
 
 	"github.com/AdguardTeam/AdGuardHome/dnsfilter"
 	"github.com/miekg/dns"
+	log "github.com/sirupsen/logrus"
 )
 
 const (
diff --git a/dnsforward/querylog_file.go b/dnsforward/querylog_file.go
index 19097baa..43a93093 100644
--- a/dnsforward/querylog_file.go
+++ b/dnsforward/querylog_file.go
@@ -5,11 +5,12 @@ import (
 	"compress/gzip"
 	"encoding/json"
 	"fmt"
-	"log"
 	"os"
 	"sync"
 	"time"
 
+	log "github.com/sirupsen/logrus"
+
 	"github.com/go-test/deep"
 )
 
diff --git a/dnsforward/querylog_top.go b/dnsforward/querylog_top.go
index b78dea79..26c896fa 100644
--- a/dnsforward/querylog_top.go
+++ b/dnsforward/querylog_top.go
@@ -3,7 +3,6 @@ package dnsforward
 import (
 	"bytes"
 	"fmt"
-	"log"
 	"net/http"
 	"os"
 	"path"
@@ -14,6 +13,8 @@ import (
 	"sync"
 	"time"
 
+	log "github.com/sirupsen/logrus"
+
 	"github.com/bluele/gcache"
 	"github.com/miekg/dns"
 )
diff --git a/dnsforward/stats.go b/dnsforward/stats.go
index 9cfe5f58..2befcad2 100644
--- a/dnsforward/stats.go
+++ b/dnsforward/stats.go
@@ -3,11 +3,12 @@ package dnsforward
 import (
 	"encoding/json"
 	"fmt"
-	"log"
 	"net/http"
 	"sync"
 	"time"
 
+	log "github.com/sirupsen/logrus"
+
 	"github.com/AdguardTeam/AdGuardHome/dnsfilter"
 )
 
diff --git a/go.mod b/go.mod
index 7567227d..22246242 100644
--- a/go.mod
+++ b/go.mod
@@ -13,6 +13,7 @@ require (
 	github.com/joomcode/errorx v0.1.0
 	github.com/miekg/dns v1.1.1
 	github.com/patrickmn/go-cache v2.1.0+incompatible
+	github.com/pkg/errors v0.8.0
 	github.com/shirou/gopsutil v2.18.10+incompatible
 	github.com/shirou/w32 v0.0.0-20160930032740-bb4de0191aa4 // indirect
 	github.com/sirupsen/logrus v1.2.0