Sql-server – SQL Server – linked Oracle server: EXECUTE permission denied on ‘xp_prop_oledb_provider’

I'm assuming that you are using a "sql server login" for the vendor's server, and you are using that when creating the linked server.

When you use a linked server, a query running on your server connects to the vendor's server. If a firewall blocks your local server from connecting to the vendor's server, your connection attempt will fail.

If connecting directly from your workstation to the vendor's server you go through a different firewall or no firewall, then the connection may succeed.

This scenario matches the behavior you describe. My usual tests would be: 1. Can I ping from my server to the vendor's server? Both by IP and by hostname? ping usually gets through firewalls. 2. Can I connect using SSMS from my server (using an RDP session) to the vendor's server? Both by IP and by hostname?

If you can ping OK but not connect with SSMS, this usually indicates that the ports for SQL Server probably need to be opened on the firewall.

In short, check all of the firewalls involved. That would include any software firewall on your server or on the vendor's server, or any hardware firewall between them.

In these situations, ping and traceroute are your friends. Ping and traceroute may help you locate the IP of the router that doesn't send your packets on to the vendor's server.

I've set GRANT on all the securables.

You want to assign roles to write data for a specific database. When I read this correct you clicked everthing to do this.

Now I think that your user is member of the role db_datawriter and db_denydatawriter. Please remove the role db_denydatawriter and try it again.