smnirosh
I think you are getting URL type domain name eg myseserver.it (called a FQDN) confused with Microsoft trusted DOMAIN (name), which are totally different things with totally seperate functions.
Read on.
I changed the domain name of that client without removing from the previous domain. Now it says
"The trust relationship between this workstation and the primary domain failed"
Well that was a big mistake. You should unjoin workstations from the DOMAIN before you change the DOMAIN name.
But based on my answer in this thread you only changed the FQDN (fully qualified domain name) which is the domain name for Internet related identity & access. That is different to the Microsoft trusted DOMAIN (name).
It sounds to me like you still have a MACHINE account on the SME server for that workstation which you will have to delete.
Please search these forums for the command to do that, maybe someone else can advise the command as I cannot quickly find it.
Once the trust relationship is broken you cannot fix it, you have to delete the MACHINE account & then rejoin the workstation to the trusted DOMAIN.
To change the trusted DOMAIN name (not the main FQDN for web access), you go into server manager Configuration section Workgroup panel, there is a setting for Workgroup & Domain (which also serves as the trusted DOMAIN name if your server is configured to be PDC (primary domain controller) or only as the Workgroup name if your server is not a PDC.
If you change this now (the trusted DOMAIN name), you will prevent all workstations from logging in to the trusted DOMAIN & be in a real big mess.
I think you were lucky as you only changed the web domain name.
What can i do with this issue to log this client to the domain.
You might get lucky, try this.
On the problematic workstation unjoin the workstation from the trusted DOMAIN.
It becomes a member of the Workgroup then.
Then change the Workgroup name on the workstation to something else completely different.
Then restart workstation.
Then join the workstation to the SME server trusted DOMAIN using the current trusted DOMAIN name as shown in server manager, & then restart the workstation. See if you can then log in to the DOMAIN.
If not successful, then I would say you have to delete the machine account for that workstation, from the SME server.
STOP & THINK before doing anything else. Read up on the topic.