troubleshooting Question

Can not connect to default instance (MSSQLSERVER) without giving port in the connection string

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iwork asked on
Microsoft SQL Server 2008
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I installed MSSQL server 2008 R2 with all the default options. When I try to connect as:

machinename/MSSQLSERVER: I can not connect.

but when I connect as:

machinename/MSSQLSERVER,1443: I can connect successfully.

Here are a few things that I tried:

1. I enabled ports 1433 and 1434 in windows firewall
2. Disabled windows firewall
3. All the SQL services are up and running such as SQL Browser, Server etc.
4. Named Pipes and TCP/IP is enabled under each section in Configuration manager.

Any ideas?...Please help me soon!
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