# Clients cannot connect to Synapse after restored backup
**URL:** https://forum.yunohost.org/t/clients-cannot-connect-to-synapse-after-restored-backup/39909
**Category:** Support apps
**Tags:** synapse, english
**Created:** [September 4, 2025, 7:40am UTC](https://forum.yunohost.org/t/clients-cannot-connect-to-synapse-after-restored-backup/39909 "2025-09-04T07:40:02Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@matalb](https://forum.yunohost.org/u/matalb)
#### Post date: [September 4, 2025, 7:40am UTC](https://forum.yunohost.org/t/clients-cannot-connect-to-synapse-after-restored-backup/39909/1 "2025-09-04T07:40:02Z")
**What type of hardware are you using** : VPS bought online
**What YunoHost version are you running** : 12.1.171
**What app is this about** : Synapse
### Describe your issue
After an unsuccessful upgrade of Synapse, I restored the last backup which ran without errors.
Now, I cannot connect to the Synapse homeserver with any client. Error messages are below.
Only once during the recent days, another user on [matrix.org](http://matrix.org) could read a test message sent from my android device, although my Element client signalled an error.
Installed Synapse version: 1.136.0~ynh1
### Share relevant logs or error messages
element-desktop (Linux):
```Connectivity
Sent messages will be stored until your connection has returned.
```
element/android: error on the top-level bar: `Connectivity to the server has been lost` or in some cases at the bottom of the last unsent message: `Messages failed to send` with the options retry or delete.
---
### Author:  [@matalb](https://forum.yunohost.org/u/matalb)
#### Post date: [September 4, 2025, 8:09am UTC](https://forum.yunohost.org/t/clients-cannot-connect-to-synapse-after-restored-backup/39909/2 "2025-09-04T08:09:18Z")
What I have tried so far:
- Logged out from element-desktop
- Tried to login again. These are the issues:
- MYDOMAIN.TLD isn’t recognized as a matrix server as it was before.
- SUBDOMAIN.MYDOMAIN.TLD is accepted
- Login via CAS results in endless spinning
- After terminating element-desktop and restarting, Element GUI is shown, but with empty persons and room list
I wonder whether Synapse is just misconfigured, but have no idea where to look.
Any help is very welcome.
---
### Author:  [@matalb](https://forum.yunohost.org/u/matalb)
#### Post date: [September 5, 2025, 8:54am UTC](https://forum.yunohost.org/t/clients-cannot-connect-to-synapse-after-restored-backup/39909/3 "2025-09-05T08:54:05Z")
Looking for options to debug Synapse server:
- Is it a permission problem?
- are the domains a problem?
- which client gives more debug information?
---
### Author:  [@matalb](https://forum.yunohost.org/u/matalb)
#### Post date: [September 7, 2025, 6:11pm UTC](https://forum.yunohost.org/t/clients-cannot-connect-to-synapse-after-restored-backup/39909/4 "2025-09-07T18:11:34Z")
I would really appreciate any help whatsoever. Synapse is not working after having restored it from backup.
It would be better than nothing, if I could do this:
- uninstall Synapse completely
- install Synapse again
My question is: Is every Yunohost user automatically a Synapse user as before?
Are just the old chat messages lost?
Thank you for every help!
---
### Author:  [@matalb](https://forum.yunohost.org/u/matalb)
#### Post date: [September 8, 2025, 10:44am UTC](https://forum.yunohost.org/t/clients-cannot-connect-to-synapse-after-restored-backup/39909/5 "2025-09-08T10:44:02Z")
Now I did a complete new installation of Synapse resulting into issues again. I suspect my server configuration. The domain is SUBDOMAIN.MYDOMAIN.TLD, the server name MYDOMAIN.TLD.
I read the post-installation notes. The suggest to define a SRV record in the DNS configuration:
```auto
_matrix._tcp.SUBDOMAIN.MYDOMAIN.TLD. 3600 IN SRV 10 0 8448 SUBDOMAIN.MYDOMAIN.TLD.
```
1. The dots after TLD. look strange. Are they realy meant like that?
2. I am not sure how to “open the TCP port 8448 on your ISP box”. But Synapse has been working for 3 or 4 years without major problems.
3. Logging in with Element-Desktop, it complaints about MYDOMAIN.TLD being not a valid matrix homeserver although I stated MYDOMAIN.TLD as domain name in the Synapse settings. With homeserver SUBDOMAIN.MYDOMAIN.TLD I can login using my matrix id. All chats and rooms are lost because Synapse was blank.
Again, any help or tipps or hints will be appreciated.
---
### Author:  [@matalb](https://forum.yunohost.org/u/matalb)
#### Post date: [September 15, 2025, 3:32pm UTC](https://forum.yunohost.org/t/clients-cannot-connect-to-synapse-after-restored-backup/39909/6 "2025-09-15T15:32:44Z")
With the new installation, I have to join every room again. The whole history is lost.
What migh be the reason that the backup cannot be restored?
---
### Author:  [@system](https://forum.yunohost.org/u/system)
#### Post date: [September 30, 2025, 3:33pm UTC](https://forum.yunohost.org/t/clients-cannot-connect-to-synapse-after-restored-backup/39909/7 "2025-09-30T15:33:06Z")
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