connect to SQL Server 2008 r2

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http://serverfault.com – I found about a dozen questions like this, read them all, but still can't find the problem. I have a dedicated server running SQL Server 2008 R2 express. I enabled TCP/IP, added firewall exceptions, enabled mixed authentication, started SQL Browser. I can connect to this database server from my home computer. But from my work computer, I can't. I can, however, connect to RDP, I can telnet 1433 and get a response. I tried connecting from work to another sql server 2008 r2 and worked. Any ideas? (HowTos)