diff --git a/kernel/conf/sync.go b/kernel/conf/sync.go
index da2899393..952509143 100644
--- a/kernel/conf/sync.go
+++ b/kernel/conf/sync.go
@@ -56,7 +56,7 @@ type WebDAV struct {
 	Password      string `json:"password"`      // 密码
 	SkipTlsVerify bool   `json:"skipTlsVerify"` // 是否跳过 TLS 验证
 	Timeout       int    `json:"timeout"`       // 超时时间，单位：秒
-	CheckURL      string `json:"checkUrl"`      // 连通性检查 URL // https://github.com/siyuan-note/siyuan/issues/7805
+	CheckURL      string `json:"checkURL"`      // 连通性检查 URL // https://github.com/siyuan-note/siyuan/issues/7805
 }
 
 const (
@@ -66,5 +66,5 @@ const (
 )
 
 func NewSyncProviderCheckURL() string {
-	return "https://www.baidu.com https://icanhazip.com https://api.ipify.org"
+	return "https://www.baidu.com"
 }
diff --git a/kernel/model/conf.go b/kernel/model/conf.go
index 774787a8e..4035198c0 100644
--- a/kernel/model/conf.go
+++ b/kernel/model/conf.go
@@ -268,7 +268,8 @@ func InitConf() {
 	}
 	Conf.Sync.S3.Endpoint = util.NormalizeEndpoint(Conf.Sync.S3.Endpoint)
 	Conf.Sync.S3.Timeout = util.NormalizeTimeout(Conf.Sync.S3.Timeout)
-	if "" == strings.TrimSpace(Conf.Sync.S3.CheckURL) {
+	Conf.Sync.S3.CheckURL = util.NormalizeCheckURL(Conf.Sync.S3.CheckURL)
+	if "" == Conf.Sync.S3.CheckURL {
 		Conf.Sync.S3.CheckURL = conf.NewSyncProviderCheckURL()
 	}
 	if nil == Conf.Sync.WebDAV {
@@ -276,7 +277,8 @@ func InitConf() {
 	}
 	Conf.Sync.WebDAV.Endpoint = util.NormalizeEndpoint(Conf.Sync.WebDAV.Endpoint)
 	Conf.Sync.WebDAV.Timeout = util.NormalizeTimeout(Conf.Sync.WebDAV.Timeout)
-	if "" == strings.TrimSpace(Conf.Sync.WebDAV.CheckURL) {
+	Conf.Sync.WebDAV.CheckURL = util.NormalizeCheckURL(Conf.Sync.WebDAV.CheckURL)
+	if "" == Conf.Sync.WebDAV.CheckURL {
 		Conf.Sync.WebDAV.CheckURL = conf.NewSyncProviderCheckURL()
 	}
 
diff --git a/kernel/util/net.go b/kernel/util/net.go
index 377e01442..742c1c24f 100644
--- a/kernel/util/net.go
+++ b/kernel/util/net.go
@@ -18,6 +18,7 @@ package util
 
 import (
 	"net/http"
+	"net/url"
 	"strings"
 	"time"
 
@@ -82,6 +83,11 @@ func InvalidIDPattern(idArg string, result *gulu.Result) bool {
 	return true
 }
 
+func IsValidURL(str string) bool {
+	_, err := url.Parse(str)
+	return nil == err
+}
+
 func initHttpClient() {
 	http.DefaultClient = httpclient.GetCloudFileClient2Min()
 	http.DefaultTransport = httpclient.NewTransport(false)
diff --git a/kernel/util/path.go b/kernel/util/path.go
index 106afd793..b6c2d679e 100644
--- a/kernel/util/path.go
+++ b/kernel/util/path.go
@@ -156,6 +156,20 @@ func NormalizeEndpoint(endpoint string) string {
 	return endpoint
 }
 
+func NormalizeCheckURL(checkURL string) string {
+	checkURL = strings.TrimSpace(checkURL)
+	if "" == checkURL {
+		return ""
+	}
+	if !strings.HasPrefix(checkURL, "http://") && !strings.HasPrefix(checkURL, "https://") {
+		checkURL = "http://" + checkURL
+	}
+	if !IsValidURL(checkURL) {
+		return ""
+	}
+	return checkURL
+}
+
 func FilterMoveDocFromPaths(fromPaths []string, toPath string) (ret []string) {
 	tmp := FilterSelfChildDocs(fromPaths)
 	for _, fromPath := range tmp {