Make sure you only initialize the connection to the Solr instance once by adding something similar to the following in the Application_Start event in Global.asax. file.
Startup.Init ("HTTP: // local: 8983 / Solr");
Can you post a snippet of code on how you open SolrConnection and request a Solr instance? What version of the SolrNet library are you using?
I am using SolrNet version 0.2.3 in an ASP.NET application using the convention described above.
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