diff --git a/app/src/config/repos.ts b/app/src/config/repos.ts
index 26ae55ae5..da0384c74 100644
--- a/app/src/config/repos.ts
+++ b/app/src/config/repos.ts
@@ -93,6 +93,11 @@ const renderProvider = (provider: number) => {
         <option ${window.siyuan.config.sync.s3.skipTlsVerify ? "" : "selected"} value="false">Verify</option>
         <option ${window.siyuan.config.sync.s3.skipTlsVerify ? "selected" : ""} value="true">Skip</option>
     </select>
+</label>
+<label class="b3-label b3-label--noborder fn__flex config__item">
+    <div class="fn__flex-center fn__size200">Connectivity Check URL</div>
+    <div class="fn__space"></div>
+    <input id="checkURL" class="b3-text-field fn__block" value="${window.siyuan.config.sync.s3.checkURL}">
 </label>`;
     } else if (provider === 3) {
         const tip = `<div class="b3-label b3-label--inner">
@@ -133,6 +138,11 @@ const renderProvider = (provider: number) => {
         <option ${window.siyuan.config.sync.webdav.skipTlsVerify ? "" : "selected"} value="false">Verify</option>
         <option ${window.siyuan.config.sync.webdav.skipTlsVerify ? "selected" : ""} value="true">Skip</option>
     </select>
+</label>
+<label class="b3-label b3-label--noborder fn__flex config__item">
+    <div class="fn__flex-center fn__size200">Connectivity Check URL</div>
+    <div class="fn__space"></div>
+    <input id="checkURL" class="b3-text-field fn__block" value="${window.siyuan.config.sync.webdav.checkURL}">
 </label>`;
     }
     return "";
@@ -217,6 +227,7 @@ const bindProviderEvent = () => {
                     region: (providerPanelElement.querySelector("#region") as HTMLInputElement).value,
                     skipTlsVerify: (providerPanelElement.querySelector("#s3SkipTlsVerify") as HTMLInputElement).value === "true",
                     timeout: timeout,
+                    checkURL: (providerPanelElement.querySelector("#checkURL") as HTMLInputElement).value,
                 };
                 fetchPost("/api/sync/setSyncProviderS3", {s3}, () => {
                     window.siyuan.config.sync.s3 = s3;
@@ -236,6 +247,7 @@ const bindProviderEvent = () => {
                     password: (providerPanelElement.querySelector("#password") as HTMLInputElement).value,
                     skipTlsVerify: (providerPanelElement.querySelector("#webdavSkipTlsVerify") as HTMLInputElement).value === "true",
                     timeout: timeout,
+                    checkURL: (providerPanelElement.querySelector("#checkURL") as HTMLInputElement).value,
                 };
                 fetchPost("/api/sync/setSyncProviderWebDAV", {webdav}, () => {
                     window.siyuan.config.sync.webdav = webdav;
diff --git a/app/src/types/index.d.ts b/app/src/types/index.d.ts
index d038c73f3..3bdabd405 100644
--- a/app/src/types/index.d.ts
+++ b/app/src/types/index.d.ts
@@ -433,6 +433,7 @@ declare interface IConfig {
             region: string
             skipTlsVerify: boolean
             timeout: number
+            checkURL: string
         }
         webdav: {
             endpoint: string
@@ -440,6 +441,7 @@ declare interface IConfig {
             password: string
             skipTlsVerify: boolean
             timeout: number
+            checkURL: string
         }
     },
     lang: string
diff --git a/kernel/conf/sync.go b/kernel/conf/sync.go
index bf80edf79..da2899393 100644
--- a/kernel/conf/sync.go
+++ b/kernel/conf/sync.go
@@ -47,6 +47,7 @@ type S3 struct {
 	PathStyle     bool   `json:"pathStyle"`     // 是否使用路径风格
 	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
 }
 
 type WebDAV struct {
@@ -55,6 +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
 }
 
 const (
@@ -62,3 +64,7 @@ const (
 	ProviderS3     = 2 // ProviderS3 为 S3 协议对象存储提供的云端存储服务
 	ProviderWebDAV = 3 // ProviderWebDAV 为 WebDAV 协议提供的云端存储服务
 )
+
+func NewSyncProviderCheckURL() string {
+	return "https://www.baidu.com https://icanhazip.com https://api.ipify.org"
+}
diff --git a/kernel/model/conf.go b/kernel/model/conf.go
index f62182955..774787a8e 100644
--- a/kernel/model/conf.go
+++ b/kernel/model/conf.go
@@ -268,11 +268,17 @@ 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 = conf.NewSyncProviderCheckURL()
+	}
 	if nil == Conf.Sync.WebDAV {
 		Conf.Sync.WebDAV = &conf.WebDAV{}
 	}
 	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 = conf.NewSyncProviderCheckURL()
+	}
 
 	if nil == Conf.Api {
 		Conf.Api = conf.NewAPI()
@@ -297,7 +303,7 @@ func InitConf() {
 	if 0 > Conf.Editor.BacklinkExpandCount {
 		Conf.Editor.BacklinkExpandCount = 0
 	}
-	if 0> Conf.Editor.BackmentionExpandCount {
+	if 0 > Conf.Editor.BackmentionExpandCount {
 		Conf.Editor.BackmentionExpandCount = 0
 	}
 
diff --git a/kernel/model/sync.go b/kernel/model/sync.go
index 1d570c1aa..e1ae9ea39 100644
--- a/kernel/model/sync.go
+++ b/kernel/model/sync.go
@@ -365,6 +365,10 @@ func SetSyncProviderS3(s3 *conf.S3) (err error) {
 	s3.Bucket = strings.TrimSpace(s3.Bucket)
 	s3.Region = strings.TrimSpace(s3.Region)
 	s3.Timeout = util.NormalizeTimeout(s3.Timeout)
+	s3.CheckURL = strings.TrimSpace(s3.CheckURL)
+	if "" == s3.CheckURL {
+		s3.CheckURL = conf.NewSyncProviderCheckURL()
+	}
 
 	Conf.Sync.S3 = s3
 	Conf.Save()
@@ -384,6 +388,10 @@ func SetSyncProviderWebDAV(webdav *conf.WebDAV) (err error) {
 	webdav.Username = strings.TrimSpace(webdav.Username)
 	webdav.Password = strings.TrimSpace(webdav.Password)
 	webdav.Timeout = util.NormalizeTimeout(webdav.Timeout)
+	webdav.CheckURL = strings.TrimSpace(webdav.CheckURL)
+	if "" == webdav.CheckURL {
+		webdav.CheckURL = conf.NewSyncProviderCheckURL()
+	}
 
 	Conf.Sync.WebDAV = webdav
 	Conf.Save()