# Cells Sync not connecting

**URL:** <https://forum.pydio.com/t/cells-sync-not-connecting/7159>\
**Category:** Pydio Cells\
**Tags:** synchronisation, docker\
**Created:** [March 22, 2025, 5:20pm UTC](https://forum.pydio.com/t/cells-sync-not-connecting/7159 "2025-03-22T17:20:30Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![loags2010](https://avatars.discourse-cdn.com/v4/letter/l/f0a364/32.png) [@loags2010](https://forum.pydio.com/u/loags2010)\
**Post date:** [March 22, 2025, 5:20pm UTC](https://forum.pydio.com/t/cells-sync-not-connecting/7159/1 "2025-03-22T17:20:30Z")

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I have Pydio cells version 4.4.11 running in a docker container. I am trying to get Cells Sync to connect on my Windows 11. When I connect I get “cannot connect to discovery endpoint: Get “[https://XXX.XXX.X.XXX:8080/a/config/discovery](https://XXX.XXX.X.XXX:8080/a/config/discovery)”: x509: certificate signed by unknown authority” Does anyone know how to resolve this issue?

Thanks

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**Author:** ![c12simple](https://yyz2.discourse-cdn.com/flex032/user_avatar/forum.pydio.com/c12simple/32/90_2.png) [@c12simple](https://forum.pydio.com/u/c12simple)\
**Post date:** [March 24, 2025, 10:22am UTC](https://forum.pydio.com/t/cells-sync-not-connecting/7159/2 "2025-03-24T10:22:32Z")

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Hi @loags2010

> [@Cells Sync: connection closed before server preface received](https://forum.pydio.com/t/cells-sync-connection-closed-before-server-preface-received/5838/9):
>
> Web & Android are base on restAPI, no local store Cells-sync do the synchronization between cells & local store so grpc is used for synchronization. Cells-sync has no interface to bypass the certificate (like you have in browser). You need to install the self-sign cert rootCA.pem to system trust root. Once the rootCA.pem is added to the system trust, your cells-sync can ‘trust’ this self-signed cert

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**Author:** ![system](https://canada1.discourse-cdn.com/flex032/uploads/pydio/original/2X/6/61f19fa52ec15fd4250db51aea351adba0e831fd.png) [@system](https://forum.pydio.com/u/system)\
**Post date:** [May 23, 2025, 10:23am UTC](https://forum.pydio.com/t/cells-sync-not-connecting/7159/3 "2025-05-23T10:23:21Z")

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Closed on May 23, 2025, 10:23am UTC

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