# Empty reply from the server when running collabora via docker **URL:** \ **Category:** User Support\ **Created:** [September 7, 2025, 9:25am UTC](https://forum.collaboraonline.com/t/empty-reply-from-the-server-when-running-collabora-via-docker/4002 "2025-09-07T09:25:13Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Ancient2114](https://avatars.discourse-cdn.com/v4/letter/a/7ba0ec/32.png) [@Ancient2114](https://forum.collaboraonline.com/u/Ancient2114)\ **Post date:** [September 7, 2025, 9:25am UTC](https://forum.collaboraonline.com/t/empty-reply-from-the-server-when-running-collabora-via-docker/4002/1 "2025-09-07T09:25:14Z")
Hello. I am running a collabora container following the documentation guide, but cannot get it to accept requests. Using image **collabora/code:25.04.5.1.1** I always get an “Empty reply from the server” message: This even happens If I curl collabora inside it´s own container: ```auto * Host localhost:9980 was resolved. * IPv6: ::1 * IPv4: 127.0.0.1 * Trying [::1]:9980... * Connected to localhost (::1) port 9980 * using HTTP/1.x > GET / HTTP/1.1 > Host: localhost:9980 > User-Agent: curl/8.14.1 > Accept: */* > * Request completely sent off * Empty reply from server * shutting down connection #0 curl: (52) Empty reply from server ``` I don´t see anything special in the logs. I see the server is listening on the expected port: ```auto │ Sec-WebSocket-Key: IQtLzx6G8Z7cTZNWstaRgg== │ │ Sec-WebSocket-Version: 13 │ │ Accept-Language: en │ │ Cache-Control: no-cache │ │ Pragma: no-cache │ │ | net/HttpRequest.cpp:159 │ │ wsd-00001-00021 2025-09-07 09:11:45.578108 +0000 [prisoner_poll] TRC #17: Child connection with URI [/coolws/newchild │ │ wsd-00001-00021 2025-09-07 09:11:45.578155 +0000 [prisoner_poll] TRC #17: New child spawned after 5164ms of requestin │ │ wsd-00001-00021 2025-09-07 09:11:45.578202 +0000 [prisoner_poll] INF #17: New child [27], jailId: RAjnO82DUo2TrgLH, c │ │ wsd-00001-00021 2025-09-07 09:11:45.578206 +0000 [prisoner_poll] TRC #17: Calling make_shared, for NewC │ │ wsd-00001-00021 2025-09-07 09:11:45.578207 +0000 [prisoner_poll] TRC #17: Upgrading to WebSocket| net/WebSocketHandle │ │ wsd-00001-00021 2025-09-07 09:11:45.578224 +0000 [prisoner_poll] INF #17: WebSocket version: 13, key: [IQtLzx6G8Z7cTZ │ │ wsd-00001-00021 2025-09-07 09:11:45.578238 +0000 [prisoner_poll] TRC #17: Sending WS Upgrade response: Date: Sun, 07 │ │ Server: │ │ Upgrade: websocket │ │ Connection: Upgrade │ │ Sec-WebSocket-Accept: 0L1feMcWn6AZa5RR4LQkPnzA/j0= │ │ | net/WebSocketHandler.hpp:1051 │ │ wsd-00001-00021 2025-09-07 09:11:45.578248 +0000 [prisoner_poll] TRC #17: Wrote 173 bytes of 173 buffered data| net/S │ │ wsd-00001-00021 2025-09-07 09:11:45.578255 +0000 [prisoner_poll] INF ChildProcess ctor [27].| wsd/Process.hpp:40 │ │ wsd-00001-00021 2025-09-07 09:11:45.578265 +0000 [prisoner_poll] TRC Adding a new child 27 with config to NewChildre │ │ wsd-00001-00021 2025-09-07 09:11:45.578268 +0000 [prisoner_poll] INF Have 1 spare child after adding [27]. Notifying. │ │ wsd-00001-00021 2025-09-07 09:11:45.578283 +0000 [prisoner_poll] TRC #16: Handling poll events of prisoner_poll at in │ │ wsd-00001-00021 2025-09-07 09:11:45.578310 +0000 [prisoner_poll] TRC #15: Handling poll events of prisoner_poll at in │ │ wsd-00001-00021 2025-09-07 09:11:45.578315 +0000 [prisoner_poll] TRC #15: setupPollFds getPollEvents: 0x1| net/Socket │ │ wsd-00001-00021 2025-09-07 09:11:45.578317 +0000 [prisoner_poll] TRC #16: setupPollFds getPollEvents: 0x1| net/Socket │ │ wsd-00001-00021 2025-09-07 09:11:45.578319 +0000 [prisoner_poll] TRC #17: setupPollFds getPollEvents: 0x1| net/Socket │ │ wsd-00001-00001 2025-09-07 09:11:40.413735 +0000 [coolwsd] INF Waiting for a new child for a max of 20000ms| wsd/COOL │ │ wsd-00001-00001 2025-09-07 09:11:45.578364 +0000 [coolwsd] TRC Have 1 new children.| wsd/COOLWSD.cpp:3791 │ │ Ready to accept connections on port 9980. │ │ │ │ frk-00022-00022 2025-09-07 09:11:45.566651 +0000 [forkit] INF Forked kit [27]| kit/ForKit.cpp:567 │ │ frk-00022-00022 2025-09-07 09:11:45.566701 +0000 [forkit] TRC Forking child took 9ms| kit/ForKit.cpp:578 │ │ frk-00022-00022 2025-09-07 09:11:45.566711 +0000 [forkit] INF Forkit initialization complete: setting log-level to [w │ │ frk-00022-00022 2025-09-07 09:11:45.580328 +0000 [forkit] WRN The systemplate directory [/opt/cool/systemplate] is re │ │ frk-00022-00022 2025-09-07 09:11:45.591550 +0000 [forkit] WRN The systemplate directory [/opt/cool/systemplate] is re │ │ frk-00022-00022 2025-09-07 09:11:45.602860 +0000 [forkit] WRN The systemplate directory [/opt/cool/systemplate] is re │ │ kit-00027-00027 2025-09-07 09:11:45.577990 +0000 [kit_spare_001] TRC #25: Set socket buffer size to 262144| net/Socke │ │ kit-00027-00027 2025-09-07 09:11:45.577994 +0000 [kit_spare_001] INF New kit client websocket inserted.| kit/Kit.cpp: │ │ kit-00027-00027 2025-09-07 09:11:45.577998 +0000 [kit_spare_001] INF Kit initialization complete: setting log-level t │ │ wsd-00001-00021 2025-09-07 09:11:45.578333 +0000 [prisoner_poll] TRC ppoll start, timeoutMicroS: 17988773 size 3| net │ │ wsd-00001-00001 2025-09-07 09:11:45.578378 +0000 [coolwsd] INF WSD initialization complete: setting log-level to [war │ │ ``` I didn´t setup a reverse proxy, as collabora will be running in my internal Kubernetes cluster, and will only be accessible by nextcloud, using the internal service. ---
**Author:** ![darshan](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.collaboraonline.com/darshan/32/2230_2.png) [@darshan](https://forum.collaboraonline.com/u/darshan)\ **Post date:** [September 7, 2025, 4:48pm UTC](https://forum.collaboraonline.com/t/empty-reply-from-the-server-when-running-collabora-via-docker/4002/2 "2025-09-07T16:48:01Z")
hii @Ancient2114 Collabora’s `coolwsd` **does not serve a normal HTTP page on `/`**. It only exposes a couple of very specific endpoints (`/hosting/discovery`, `/loleaflet/*`, `/cool/*`) that are meant to be consumed by Nextcloud/OwnCloud/Seafile/etc. If you just hit `/` with curl, it immediately closes the connection, which is why you see “Empty reply from server.” ### How to verify it’s working Instead of: ```auto curl -v http://localhost:9980/ ``` try: ```auto curl -vk http://localhost:9980/hosting/discovery ``` Thanks Darshan ---
**Author:** ![Ancient2114](https://avatars.discourse-cdn.com/v4/letter/a/7ba0ec/32.png) [@Ancient2114](https://forum.collaboraonline.com/u/Ancient2114)\ **Post date:** [September 7, 2025, 6:01pm UTC](https://forum.collaboraonline.com/t/empty-reply-from-the-server-when-running-collabora-via-docker/4002/3 "2025-09-07T18:01:52Z")
> [@darshan](#): > > `curl -vk http://localhost:9980/hosting/discovery` Same issue. A ```auto cool@collabora-b99bc56cf-ddbjd:/$ curl -vk http://localhost:9980/hosting/discovery * Host localhost:9980 was resolved. * IPv6: ::1 * IPv4: 127.0.0.1 * Trying [::1]:9980... * Connected to localhost (::1) port 9980 * using HTTP/1.x > GET /hosting/discovery HTTP/1.1 > Host: localhost:9980 > User-Agent: curl/8.14.1 > Accept: */* > * Request completely sent off * Empty reply from server * shutting down connection #0 curl: (52) Empty reply from server ``` I am not doing anything special. Here is my kubernetes deployment. ```auto apiVersion: apps/v1 kind: Deployment metadata: name: collabora spec: strategy: type: RollingUpdate rollingUpdate: maxSurge: 1 maxUnavailable: 0 replicas: 1 selector: matchLabels: app.kubernetes.io/name: collabora template: spec: serviceAccountName: collabora containers: - name: collabora image: collabora/code:25.04.5.1.1 imagePullPolicy: IfNotPresent ports: - containerPort: 9980 name: http env: - name: domain value: "nextcloud\\.my.\\domain.\\dev" ```