Azure DocumentDB 偶尔抛出 SocketException / GoneException
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【中文标题】Azure DocumentDB 偶尔抛出 SocketException / GoneException【英文标题】：Azure DocumentDB sporadically throws SocketException / GoneException 【发布时间】：2017-06-23 13:55:41 【问题描述】：更新（2/8/17）：
请参阅下面的答案。
更新（2/7/17）：
我发现重新启动可以让我从 Visual Studio 2015 成功运行 Web 应用程序，并多次点击端点。但是，当我停止应用程序并重新启动它时，它很可能会失败。然后它会反复失败，直到我重新启动计算机。重启VS'15还不够好。
一旦开始失败，从 VS Code 或使用 dotnet.exe 从命令行运行应用程序会表现出相同的行为。
原帖：
我们设置了一个微服务系统，该系统从几个 API 和 Azure Functions 调用 DocumentDB 集合。它间歇性地失败，来自 API 端的 SocketException（GoneException 嵌套在其中）。据我们所知，鉴于它偶尔会起作用，调用它的代码大多是正确的。 Azure Functions 可以正常工作。
为澄清而编辑：通过“间歇性”，我的意思是它可能每天短暂工作一次或两次，然后在一天的剩余时间里进入失败状态，没有电话通过。这不是每 100 个左右的呼叫中就有 1 个失败。这更像是 1 或 2 次成功调用后的不间断故障。
通过编写一个简单的控制台应用程序从 DocumentDB 读取并将结果打印到 Debug 输出，我能够重新创建相同的异常。这运行一两次没有任何问题，然后每次都开始抛出以下异常。它有时会这样做几个小时，然后再允许几个呼叫通过，然后再次抛出。
虽然下面的测试器是原始的，但主 API 充分利用了 vNext 项目结构。它使用单例 DocumentClient 进行连接（通过本机 DI 注入），并且从控制器到调用数据库的服务层几乎完全异步。我们使用单独的库来管理对 DocumentDB 的访问（如果集合不存在则创建集合、添加扩展方法、简单的 CRUD 操作等），但如下所示直接调用会产生相同的结果。
我注意到的一件事是，它在 DocumentDB 客户端 ("Microsoft.Azure.DocumentDB.Core": "1.0.0") 的核心版本上比在 net46 版本上成功得多。由于其他库，我们的 API 需要 4.6。
我可以在多台机器、多个网络、多种连接类型上重新创建它。
问题：为什么我们会收到此异常以及如何解决？
Azure 信息：
美国东部 2 1000 RU/秒 标准层 会话一致性惰性索引策略：
“indexingMode”：“懒惰”， “自动”：是的， “包含路径”：[ “小路”： ”/*”， “索引”：[ “种类”：“范围”， “数据类型”：“数字”， “精度”：-1 , “种类”：“哈希”， “数据类型”：“字符串”， “精度”：3 ] ], “排除路径”：[]
测试类
using System;
using System.Diagnostics;
using System.Threading.Tasks;
using Microsoft.Azure.Documents.Client;
using Microsoft.Azure.Documents.Linq;
using Newtonsoft.Json;
namespace TestConnection
public class Program
public static void Main(string[] args)
try
using (var client = new DocumentClient(
new Uri("https://<our-docdb-name>.documents.azure.com:443/"),
"our access key",
new ConnectionPolicy
ConnectionMode = ConnectionMode.Direct,
ConnectionProtocol = Protocol.Tcp
))
var query = client.CreateDocumentQuery(UriFactory.CreateCollectionUri("Imports", "User"),
"SELECT * FROM c where c.importId = \"816d8e92-bd08-4705-9989-09a0ece5892a\"");
var docQuery = query.AsDocumentQuery();
GetResults(docQuery).Wait();
Debug.WriteLine("done");
catch (Exception e)
Debug.WriteLine(e);
private static async Task GetResults(IDocumentQuery<dynamic> docQuery)
Debug.WriteLine("getting");
var results = await docQuery.ExecuteNextAsync();
Debug.WriteLine(JsonConvert.SerializeObject(results));
project.json
"version": "1.0.0-*",
"buildOptions":
"debugType": "portable",
"emitEntryPoint": true
,
"dependencies":
"Microsoft.Azure.DocumentDB": "1.11.3"
,
"frameworks":
"net46":
例外
'TestConnection.exe' (CLR v4.0.30319: DefaultDomain): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_64\mscorlib\v4.0_4.0.0.0__b77a5c561934e089\mscorlib.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'TestConnection.exe' (CLR v4.0.30319: DefaultDomain): Loaded 'C:\projects\TestConnection\src\TestConnection\bin\Debug\net46\win7-x64\TestConnection.exe'. Symbols loaded.
'TestConnection.exe' (CLR v4.0.30319: TestConnection.exe): Loaded 'C:\projects\TestConnection\src\TestConnection\bin\Debug\net46\win7-x64\Microsoft.Azure.Documents.Client.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'TestConnection.exe' (CLR v4.0.30319: TestConnection.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'TestConnection.exe' (CLR v4.0.30319: TestConnection.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Core\v4.0_4.0.0.0__b77a5c561934e089\System.Core.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'TestConnection.exe' (CLR v4.0.30319: TestConnection.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'TestConnection.exe' (CLR v4.0.30319: TestConnection.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Net.Http\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Net.Http.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'TestConnection.exe' (CLR v4.0.30319: TestConnection.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Xml\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'TestConnection.exe' (CLR v4.0.30319: TestConnection.exe): Loaded 'C:\projects\TestConnection\src\TestConnection\bin\Debug\net46\win7-x64\Newtonsoft.Json.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
DocDBTrace Information: 0 : DocumentClient with id 1 initialized at endpoint: https://<our-docdb-name>.documents.azure.com/ with ConnectionMode: Direct, connection Protocol: Tcp, and consistency level: null
getting
'TestConnection.exe' (CLR v4.0.30319: TestConnection.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\Microsoft.CSharp\v4.0_4.0.0.0__b03f5f7f11d50a3a\Microsoft.CSharp.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'TestConnection.exe' (CLR v4.0.30319: TestConnection.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Numerics\v4.0_4.0.0.0__b77a5c561934e089\System.Numerics.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'TestConnection.exe' (CLR v4.0.30319: TestConnection.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Runtime.Serialization\v4.0_4.0.0.0__b77a5c561934e089\System.Runtime.Serialization.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'TestConnection.exe' (CLR v4.0.30319: TestConnection.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Xml.Linq\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.Linq.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'TestConnection.exe' (CLR v4.0.30319: TestConnection.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_64\System.Data\v4.0_4.0.0.0__b77a5c561934e089\System.Data.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
DocDBTrace Information: 0 : Set WriteEndpoint https://<our-docdb-name>-eastus2.documents.azure.com/ ReadEndpoint https://<our-docdb-name>-eastus2.documents.azure.com/
DocDBTrace Information: 0 : Mapped resourceName dbs/Imports/colls/User to resourceId u81pAO1OFwA=. '00000000-0000-0000-0000-000000000000'
DocDBTrace Information: 0 : Mapped resourceName dbs/Imports/colls/User to resourceId u81pAO1OFwA=. '00000000-0000-0000-0000-000000000000'
The thread 0x3888 has exited with code 0 (0x0).
The thread 0x2c20 has exited with code 0 (0x0).
The thread 0x39fc has exited with code 0 (0x0).
The thread 0x3610 has exited with code 0 (0x0).
The thread 0x3824 has exited with code 0 (0x0).
The thread 0x33d8 has exited with code 0 (0x0).
The thread 0x38d0 has exited with code 0 (0x0).
DocDBTrace Information: 0 : GetOpenConnection failed: RID: dbs/Imports/colls/User, ResourceType Document, Op: (operationType: Query, resourceType: Document), Address: rntbd://bn6prdddc05-docdb-1.documents.azure.com:18817/apps/d54f0cf3-23d7-4050-9810-99d319d441a8/services/d77a45f3-5611-4c1d-a08e-0f3ef60a31d9/partitions/wkjhgkwj-c85a-4b08-b026-6bc8010b1bb5/replicas/131287308072454308s/, Exception: Microsoft.Azure.Documents.GoneException: Message: The requested resource is no longer available at the server.
ActivityId: d71bc76d-1411-414d-a844-9f76a46ebcfd, Request URI: rntbd://bn6prdddc05-docdb-1.documents.azure.com:18817/apps/d54f0cf3-23d7-4050-9810-99d319d441a8/services/d77a45f3-5611-4c1d-a08e-0f3ef60a31d9/partitions/wkjhgkwj-c85a-4b08-b026-6bc8010b1bb5/replicas/131287308072454308s/ ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 13.68.28.135:18817
at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
at System.Net.Sockets.TcpClient.EndConnect(IAsyncResult asyncResult)
at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.RntbdConnection.<OpenSocket>d__1c.MoveNext()
--- End of inner exception stack trace ---
at Microsoft.Azure.Documents.RntbdConnection.<OpenSocket>d__1c.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.RntbdConnection.<Open>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.RntbdConnectionDispenser.<OpenNewConnection>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.ConnectionPool.<GetOpenConnection>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.ConnectionPoolManager.<GetOpenConnection>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.RntbdTransportClient.<InvokeStoreAsync>d__0.MoveNext()
DocDBTrace Information: 0 : Exception Microsoft.Azure.Documents.GoneException: Message: The requested resource is no longer available at the server.
ActivityId: d71bc76d-1411-414d-a844-9f76a46ebcfd, Request URI: rntbd://bn6prdddc05-docdb-1.documents.azure.com:18817/apps/d54f0cf3-23d7-4050-9810-99d319d441a8/services/d77a45f3-5611-4c1d-a08e-0f3ef60a31d9/partitions/wkjhgkwj-c85a-4b08-b026-6bc8010b1bb5/replicas/131287308072454308s/ ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 13.68.28.135:18817
at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
at System.Net.Sockets.TcpClient.EndConnect(IAsyncResult asyncResult)
at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.RntbdConnection.<OpenSocket>d__1c.MoveNext()
--- End of inner exception stack trace ---
at Microsoft.Azure.Documents.RntbdConnection.<OpenSocket>d__1c.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.RntbdConnection.<Open>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.RntbdConnectionDispenser.<OpenNewConnection>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.ConnectionPool.<GetOpenConnection>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.ConnectionPoolManager.<GetOpenConnection>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.RntbdTransportClient.<InvokeStoreAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.StoreReader.<CompleteActivity>d__1f.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.StoreReader.<ReadMultipleReplicasInternalAsync>d__a.MoveNext() is thrown while doing readMany
DocDBTrace Warning: 0 : Received gone exception, will retry, Microsoft.Azure.Documents.GoneException: Message: The requested resource is no longer available at the server.
ActivityId: d71bc76d-1411-414d-a844-9f76a46ebcfd, Request URI: rntbd://bn6prdddc05-docdb-1.documents.azure.com:18817/apps/d54f0cf3-23d7-4050-9810-99d319d441a8/services/d77a45f3-5611-4c1d-a08e-0f3ef60a31d9/partitions/wkjhgkwj-c85a-4b08-b026-6bc8010b1bb5/replicas/131287308072454308s/ ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 13.68.28.135:18817
at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
at System.Net.Sockets.TcpClient.EndConnect(IAsyncResult asyncResult)
at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.RntbdConnection.<OpenSocket>d__1c.MoveNext()
--- End of inner exception stack trace ---
at Microsoft.Azure.Documents.StoreReader.<ReadMultipleReplicasInternalAsync>d__a.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.StoreReader.<ReadMultipleReplicaAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.ConsistencyReader.<ReadSessionAsync>d__8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.ReplicatedResourceClient.<InvokeAsync>d__b.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.ReplicatedResourceClient.<>c__DisplayClass1.<<InvokeAsync>b__0>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.BackoffRetryUtility`1.<>c__DisplayClassf`1.<<ExecuteAsync>b__d>d__11.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.BackoffRetryUtility`1.<ExecuteRetry>d__1b.MoveNext()
The thread 0x36e4 has exited with code 0 (0x0).
The thread 0x3adc has exited with code 0 (0x0).
The thread 0x3a68 has exited with code 0 (0x0).
The thread 0x18b0 has exited with code 0 (0x0).
...
/* The above repeats about 3 more times.*/
...
The program '[14648] TestConnection.exe' has exited with code 0 (0x0).
【问题讨论】：
您是否想过让您的通话更有弹性？有关实施建议，请参阅***.com/questions/31065690/…。在分布式环境中，网络调用始终是个问题。 谢谢你的建议，彼得。我们最初实现了这个，但由于 (1) 它与 NetStandard 缺乏兼容性（许多使用我们的 DocDB 库的应用程序严格来说是 .NET Core），我们将其删除，(2) 很多细微的差异变得过于繁琐维护（例如，IReliableReadWriteDocumentClient.CreateQuery 返回一个IQueryable 而不是IOrderedQueryable），最重要的是（3）我们仍然有异常。不过我会尝试重新实现，以防万一发生了其他变化。
发生这种情况时，您是否有任何其他客户端同时在同一端点上发出请求？发生这种情况时，您的 CPU 是否在窥视？当已经发出其他请求时，您可能正在运行简单的控制台应用程序，因此您会收到此异常。您可以尝试在 ConnectionPolicy 中添加 RetryOptions.MaxRetryAttemptsOnThrottledRequests = 0 以查看它是否发生得更少（那时您可能会得到 429）。
我还想知道您是如何在实际应用程序中实例化客户端的。我假设它是一个网络应用程序。请注意，如果您在控制器构造函数中实例化客户端，它将为每个请求实例化。您需要确保它被标记为静态并且只设置一次（当支持字段为空时）。最好在客户端初始化周围添加一些日志，以便您确定是否实例化了多个客户端。
我们将在不久的将来弃用 TransientFaultHandling 包，所以我不会依赖它。
【参考方案1】：
原来是我们的企业 Bitdefender Endpoint Security 导致了这个问题。我们最初并没有怀疑它，因为它非常清楚地记录了dotnet.exe 被列入白名单，并允许在我们运行应用程序时在适当的端口上进行通信。我们卸载了它，问题就消失了。我们正在调查究竟是什么阻止了导致问题，但至少我们知道有一个临时解决方案并且原始问题与代码无关。希望这对某人有所帮助。
【讨论】：
【参考方案2】：与接受的答案类似，几天前我突然开始遇到这个问题（非常偶尔能够使用 cosmos 客户端连接到 cosmos db，但大多出现 SSL 错误）。最初我想知道 cosmos 是否已经开始拒绝 TLS 1.0 连接，因为如今 ISP 和服务器主机“终于”强制执行 TLS 1.2 的情况并不少见，结果发现有人无意中在堆栈深处的某个地方使用了 TLS 1.0/1。
但实际上 Windows 10 默认使用 TLS 1.2，而 .net core 使用 O/S 默认 TLS 设置，所以不是这样。
原来是 McAfee LiveSafe 导致了问题。
我正在使用 .net core 3.1，Microsoft.Azure.Cosmos 3.7.0-preview2。
我还没有想出如何将我的 cosmos 连接“仅”列入白名单/无论如何，但关闭 McAfee LiveSafe 实时扫描和防火墙已经解决了问题。
【讨论】：
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