# EROBaseAsyncSocketError: Response already sent
**URL:** https://talk.remobjects.com/t/erobaseasyncsocketerror-response-already-sent/33669
**Category:** Remoting SDK
**Created:** [July 22, 2026, 8:58am UTC](https://talk.remobjects.com/t/erobaseasyncsocketerror-response-already-sent/33669 "2026-07-22T08:58:58Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@obones](https://talk.remobjects.com/u/obones)
#### Post date: [July 22, 2026, 8:58am UTC](https://talk.remobjects.com/t/erobaseasyncsocketerror-response-already-sent/33669/1 "2026-07-22T08:58:58Z")
Hello,
I have just updated ROSDK to version 10.0.0.1627 and while running my set of tests, I’m now seeing the exception in the title with the following call stack:
```auto
exception class : EROBaseAsyncSocketError
exception message : Response already sent.
thread $26c0 (TROClientThread):
00741d53 +04b ASMServer.exe uROAsyncHttpServer 434 +2 TROAsyncContext.SendResponse
00192370 +010 ASMServer.exe System 39031 +10 @IntfClear
00192381 +009 ASMServer.exe System 39078 +6 @IntfCopy
00748898 +11c ASMServer.exe uROSuperHttpServer 261 +18 TROSuperHTTPServer.SendResponse
007217c9 +0b9 ASMServer.exe uROBaseSuperHttpServer 971 +9 TROBaseSuperHTTPServer.AddWaitingRequest
0072312f +72b ASMServer.exe uROBaseSuperHttpServer 1486 +165 TROBaseSuperHTTPServer.IncomingData
00723a6f +8a3 ASMServer.exe uROBaseSuperHttpServer 1637 +126 TROBaseSuperHTTPServer.HandleRequest
0074868a +04a ASMServer.exe uROSuperHttpServer 223 +1 TROSuperHTTPServer.IntRequest
00741a2f +08f ASMServer.exe uROAsyncHttpServer 396 +9 TROAsyncContext.DoRequest
00741792 +68a ASMServer.exe uROAsyncHttpServer 378 +76 TROAsyncContext.DoRead
007426fd +05d ASMServer.exe uROAsyncHttpServer 627 +3 TROAsyncHTTPServer.DoNewConnection
007464ca +03a ASMServer.exe uROAsyncSocket 155 +2 TROClientThread.IntExecute
0051be57 +07f ASMServer.exe uROInitializedThread 58 +7 TROInitializedThread.Execute
00240913 +02b ASMServer.exe madExcept HookedTThreadExecute
0024097e +096 ASMServer.exe madExcept HookedTThreadExecute
002d23d1 +049 ASMServer.exe System.Classes 15845 +18 ThreadProc
002d2434 +0ac ASMServer.exe System.Classes 15874 +47 ThreadProc
0018ccac +028 ASMServer.exe System 25778 +45 ThreadWrapper
002407f9 +00d ASMServer.exe madExcept CallThreadProcSafe
0024085e +032 ASMServer.exe madExcept ThreadExceptFrame
002408d4 +0a8 ASMServer.exe madExcept ThreadExceptFrame
76f05d47 +017 KERNEL32.DLL BaseThreadInitThunk
>> created by thread $2158 (TROListenThread) at:
002d2498 +018 ASMServer.exe System.Classes 15903 +1 TThread.Create
thread $26c0 (TROClientThread), inner exception level 1:
>> EROBaseAsyncSocketError, Response already sent
00741d53 +04b ASMServer.exe uROAsyncHttpServer 434 +2 TROAsyncContext.SendResponse
00192370 +010 ASMServer.exe System 39031 +10 @IntfClear
00192381 +009 ASMServer.exe System 39078 +6 @IntfCopy
00748898 +11c ASMServer.exe uROSuperHttpServer 261 +18 TROSuperHTTPServer.SendResponse
007217c9 +0b9 ASMServer.exe uROBaseSuperHttpServer 971 +9 TROBaseSuperHTTPServer.AddWaitingRequest
0072312f +72b ASMServer.exe uROBaseSuperHttpServer 1486 +165 TROBaseSuperHTTPServer.IncomingData
00723a6f +8a3 ASMServer.exe uROBaseSuperHttpServer 1637 +126 TROBaseSuperHTTPServer.HandleRequest
0074868a +04a ASMServer.exe uROSuperHttpServer 223 +1 TROSuperHTTPServer.IntRequest
00741a2f +08f ASMServer.exe uROAsyncHttpServer 396 +9 TROAsyncContext.DoRequest
00741792 +68a ASMServer.exe uROAsyncHttpServer 378 +76 TROAsyncContext.DoRead
007426fd +05d ASMServer.exe uROAsyncHttpServer 627 +3 TROAsyncHTTPServer.DoNewConnection
007464ca +03a ASMServer.exe uROAsyncSocket 155 +2 TROClientThread.IntExecute
0051be57 +07f ASMServer.exe uROInitializedThread 58 +7 TROInitializedThread.Execute
002d23d1 +049 ASMServer.exe System.Classes 15845 +18 ThreadProc
002d2434 +0ac ASMServer.exe System.Classes 15874 +47 ThreadProc
0018ccac +028 ASMServer.exe System 25778 +45 ThreadWrapper
002407f9 +00d ASMServer.exe madExcept CallThreadProcSafe
0024085e +032 ASMServer.exe madExcept ThreadExceptFrame
002408d4 +0a8 ASMServer.exe madExcept ThreadExceptFrame
76f05d47 +017 KERNEL32.DLL BaseThreadInitThunk
002d2498 +018 ASMServer.exe System.Classes 15903 +1 TThread.Create
thread $26c0 (TROClientThread), inner exception level 2:
>> EROBaseAsyncSocketError, Response already sent
00741d53 +04b ASMServer.exe uROAsyncHttpServer 434 +2 TROAsyncContext.SendResponse
00192370 +010 ASMServer.exe System 39031 +10 @IntfClear
00192381 +009 ASMServer.exe System 39078 +6 @IntfCopy
00748898 +11c ASMServer.exe uROSuperHttpServer 261 +18 TROSuperHTTPServer.SendResponse
007217c9 +0b9 ASMServer.exe uROBaseSuperHttpServer 971 +9 TROBaseSuperHTTPServer.AddWaitingRequest
0072312f +72b ASMServer.exe uROBaseSuperHttpServer 1486 +165 TROBaseSuperHTTPServer.IncomingData
00723a6f +8a3 ASMServer.exe uROBaseSuperHttpServer 1637 +126 TROBaseSuperHTTPServer.HandleRequest
0074868a +04a ASMServer.exe uROSuperHttpServer 223 +1 TROSuperHTTPServer.IntRequest
00741a2f +08f ASMServer.exe uROAsyncHttpServer 396 +9 TROAsyncContext.DoRequest
00741792 +68a ASMServer.exe uROAsyncHttpServer 378 +76 TROAsyncContext.DoRead
007426fd +05d ASMServer.exe uROAsyncHttpServer 627 +3 TROAsyncHTTPServer.DoNewConnection
007464ca +03a ASMServer.exe uROAsyncSocket 155 +2 TROClientThread.IntExecute
0051be57 +07f ASMServer.exe uROInitializedThread 58 +7 TROInitializedThread.Execute
002d23d1 +049 ASMServer.exe System.Classes 15845 +18 ThreadProc
002d2434 +0ac ASMServer.exe System.Classes 15874 +47 ThreadProc
0018ccac +028 ASMServer.exe System 25778 +45 ThreadWrapper
002407f9 +00d ASMServer.exe madExcept CallThreadProcSafe
0024085e +032 ASMServer.exe madExcept ThreadExceptFrame
002408d4 +0a8 ASMServer.exe madExcept ThreadExceptFrame
76f05d47 +017 KERNEL32.DLL BaseThreadInitThunk
002d2498 +018 ASMServer.exe System.Classes 15903 +1 TThread.Create
```
This is quite annoying as it leads to the server termination, effectively resulting in a denial of service.
This happens with only the SSL server part, which uses a `TROSuperHTTPServer` instance with `OpenSSL.SSLEnabled` set to true.
Now, this is a quite elusive issue in that if I don’t run some other unit tests before hand, it doesn’t arise.
But as I’m still investigating to narrow down the precise conditions needed to reproduce this, I’m also looking for opinions from your side as to what could be causing this.
Regards
---
### Author:  [@EvgenyK](https://talk.remobjects.com/u/EvgenyK)
#### Post date: [July 22, 2026, 9:29am UTC](https://talk.remobjects.com/t/erobaseasyncsocketerror-response-already-sent/33669/2 "2026-07-22T09:29:49Z")
Hi,
this is known issue and we working with it.
as a temporary workaround, you can use synapse version of server: TROSynapseSuperHTTPServer.
note: self-signed SSL certificates are compatible between servers.
---
### Author:  [@obones](https://talk.remobjects.com/u/obones)
#### Post date: [July 22, 2026, 9:40am UTC](https://talk.remobjects.com/t/erobaseasyncsocketerror-response-already-sent/33669/3 "2026-07-22T09:40:56Z")
Good to know that you are aware of the issue.
Note that I decided to use `TROSuperHTTPServer` when all the other parts of my server/clients are already based on Synapse because with the previous version (1581), there was no `OpenSSL` property on `TROSynapseSuperHTTPServer`
And unless I bodged the migration to 1627, I still don’t see SSL related properties on `TROSynapseSuperHTTPServer`.
---
### Author:  [@EvgenyK](https://talk.remobjects.com/u/EvgenyK)
#### Post date: [July 22, 2026, 10:03am UTC](https://talk.remobjects.com/t/erobaseasyncsocketerror-response-already-sent/33669/4 "2026-07-22T10:03:37Z")
Hi,
common steps for adding OpenSSL support to Synapse library:
add `ssl_openssl3` unit to project. it will add SSL support to synapse library.
* * *
**EDIT** : Looks like we haven’t added possibility to configure SSL in TROSynapseSuperHTTPServer ☹
---
### Author:  [@obones](https://talk.remobjects.com/u/obones)
#### Post date: [July 22, 2026, 1:59pm UTC](https://talk.remobjects.com/t/erobaseasyncsocketerror-response-already-sent/33669/5 "2026-07-22T13:59:15Z")
Is this something that could be considered for a future release?
---
### Author:  [@RemObjectsSoftware](https://talk.remobjects.com/u/RemObjectsSoftware)
#### Post date: [July 23, 2026, 6:39am UTC](https://talk.remobjects.com/t/erobaseasyncsocketerror-response-already-sent/33669/6 "2026-07-23T06:39:52Z")
Logged as [bugs://D19690](https://www.remobjects.com/portal/bugs/?id=D19690).
---
### Author:  [@EvgenyK](https://talk.remobjects.com/u/EvgenyK)
#### Post date: [July 23, 2026, 6:42am UTC](https://talk.remobjects.com/t/erobaseasyncsocketerror-response-already-sent/33669/7 "2026-07-23T06:42:37Z")
Hi,
> [@obones](#):
>
> Is this something that could be considered for a future release?
I’ve logged issue with low priority so don’t wait that it will be in next release