# Cannot login to server on new clients
**URL:** https://vaultwarden.discourse.group/t/cannot-login-to-server-on-new-clients/2403
**Category:** Third Party Help
**Created:** [February 23, 2023, 5:37am UTC](https://vaultwarden.discourse.group/t/cannot-login-to-server-on-new-clients/2403 "2023-02-23T05:37:35Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Checole](https://vaultwarden.discourse.group/u/Checole)
#### Post date: [February 23, 2023, 5:37am UTC](https://vaultwarden.discourse.group/t/cannot-login-to-server-on-new-clients/2403/1 "2023-02-23T05:37:35Z")
4 minutes ago
I have installed vaultwarden, formerly bitwarden as docker on Synology.
I downloaded the client and installed extensions on all Webbrowsers, including safari, chrome, edge and opera.
So far everything worked always fine.
Now,
first, I could not connect anymore on opera,
next I could not connect anymore on my new MacBook.
The error message is: ‘cannot read properties of null (reading iterations)’
On my old device (apart from Opera) it is still working.
Any help much appreciated!!!
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### Author:  [@stefan0xC](https://vaultwarden.discourse.group/u/stefan0xC)
#### Post date: [February 23, 2023, 6:58am UTC](https://vaultwarden.discourse.group/t/cannot-login-to-server-on-new-clients/2403/2 "2023-02-23T06:58:54Z")
Why are you cross-posting the same question if you already got an answer?
> **[Cannot login to server on new clients · Discussion #3275 ·...](https://github.com/dani-garcia/vaultwarden/discussions/3275)**
>
> I have installed vaultwarden, formerly bitwarden as docker on Synology. I downloaded the client and installed extensions on all Webbrowsers, including safari, chrome, edge and opera. So far everyth...