# Pydio Cells 4.4.9 // CellsSync error sync

**URL:** <https://forum.pydio.com/t/pydio-cells-4-4-9-cellssync-error-sync/6498>\
**Category:** Sync Client\
**Created:** [January 30, 2025, 8:06am UTC](https://forum.pydio.com/t/pydio-cells-4-4-9-cellssync-error-sync/6498 "2025-01-30T08:06:35Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Franck](https://yyz2.discourse-cdn.com/flex032/user_avatar/forum.pydio.com/franck/32/2711_2.png) [@Franck](https://forum.pydio.com/u/Franck)\
**Post date:** [January 30, 2025, 8:06am UTC](https://forum.pydio.com/t/pydio-cells-4-4-9-cellssync-error-sync/6498/1 "2025-01-30T08:06:35Z")

</div>

Hi all,

i’ve recently installed Pydio Cells on Debian 12 behind pfSense / HAProxy (reverse proxy). All is good site Pydio Cells;

Reverseproxy is 443 with certificate and request pydio http 80.

My problem is about CellsSync on windows client.  
I can login on my pydio, but when i start sync, TLS error appears.

I saw ports can be in range 30000 - 50000, so i add NAT pfsense 30000 → 50000 to internal Vlan IP Pydio; but nothing better.

I see 35929 port in my pydio.json

“pydio.grpc.data.sync.cellsdata”: {  
“ApiKey”: “XXXXX”,  
“ApiSecret”: “XXXXX”,  
“FlatStorage”: true,  
“Name”: “cellsdata”,  
“ObjectsBucket”: “cellsdata”,  
“ObjectsPort”: 35929,  
“ObjectsServiceName”: “local1”,  
“StorageConfiguration”: {  
“folder”: “/root/.config/pydio/cells/data/cellsdata”,  
“hashingVersion”: “v4”,  
“normalize”: “false”  
}  
}

but its in range i talked before.

I know error is TLS;  
CellsSync say : connection error: desc = “transport: authentication handshake failed: tls: first record does not look like a TLS handshake”

i dont know if its port 35929 to redirect to HTTPS or other thing to edit.

thk in advance

---

<div class="post-metadata">

**Author:** ![Franck](https://yyz2.discourse-cdn.com/flex032/user_avatar/forum.pydio.com/franck/32/2711_2.png) [@Franck](https://forum.pydio.com/u/Franck)\
**Post date:** [January 30, 2025, 12:58pm UTC](https://forum.pydio.com/t/pydio-cells-4-4-9-cellssync-error-sync/6498/2 "2025-01-30T12:58:44Z")

</div>

i checked : HTTP/2 is active on my reverseproxy

curl -I -k --http2 [https://pydio.xxxxx.fr](https://pydio.xxxxx.fr)  
HTTP/2 200  
content-type: text/html; charset=utf-8  
server: Caddy  
x-xss-protection: 1; mode=block  
date: Thu, 30 Jan 2025 12:43:18 GMT

I continue to search : but HELP 😛 😉