check any Ip or coputer name conflicts on the network and DNS server problems .ALso check any firewall issues or virus infected on the network servers.
Regards,
V.K.
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SQL 2000 Aliases Stopped working / Network or ODBC Problem
We have a Windows 2000 machine running SQL 2000, in SQL there are a couple aliases created to connect to specific ports 40008 and 40009 on two Windows 2003 Server Std machines located on another domain. The problem is that the aliases just stopped working (after years of flawless operation).
When I go to SQL Query Analyzer and try to manually connect to the Windows 2003 database servers on the other domain I get:
Unable to connect to Server <servername>
Server: Msg 17, Level 16, State 1
[Microsoft][ODBC SQL Server Driver][TCP/IP Sockets] SQL Server does not exist or access denied
Some additional information about the problem and things I've tried:
-Rebooted the machine having the problem
-No odd information in any event log, app log or secruity log (On all related hardware.. Servers and firewalls) Other than I can see the time and date when the service that uses the aliases stopped working.
-Checked the Firewalls to make sure the Policy allowing the the special ports are enabled and rebooted both firewalls in question.
-Tried using Telnet between the two networks on the specialized ports 40008/9 and other known open ports with no success either
At this point it seems to be a machine level or maybe ODBC connection thing
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Answers
The problem came down to our ISP turning off Arp-Proxy on their main Cisco router. The subnet mask on the VPN tunnel between our two networks had a wrong subnet mask and their arp-proxy service was covering the problem literally for the last 4 years! When the ISP shut the arp-proxy service down our subnet mask flaw kept data from flowing between the two networks.
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by: rboyd56Posted on 2007-03-09 at 07:13:25ID: 18687658
If you cannot telnet to the ports then you will not be able to connect to the SQL Server either. If this is the case then it may be more of a network problem than a connectivity problem.