c# - Arithmetic overflow exception when opening SQL connection

Question

I got very weird ArithmeticOverflowException when opening an SQL connection to the underlying SQL database (stack trace included below). It doesn't make a difference which version of the server is used (I've verified MS SQL 2005/2008/2012/2014), error is still the same. All the newest updates and patches from Windows Update installed. OS is Windows 8.1 / 10 (same occurs on both systems). Server is installed locally and the connection is made via user and password. Connection timeout verified in range from 15 to 1000 sec.

The most surprising thing is the application works just fine, and communicates with the server properly, executing many various queries, but suddenly this exception occurs. I noticed this exception started showing up after some windows update (no idea which one).

I've looked into the .NET code, but have no idea what can cause the arithmetic overflow exception there...

-- STACK TRACE --

in SNIOpenSyncExWrapper(SNI_CLIENT_CONSUMER_INFO* , SNI_ConnWrapper** )
in SNINativeMethodWrapper.SNIOpenSyncEx(ConsumerInfo consumerInfo, String constring, IntPtr& pConn, Byte[] spnBuffer, Byte[] instanceName, Boolean fOverrideCache, Boolean fSync, Int32 timeout, Boolean fParallel)
in System.Data.SqlClient.SNIHandle..ctor(ConsumerInfo myInfo, String serverName, Byte[] spnBuffer, Boolean ignoreSniOpenTimeout, Int32 timeout, Byte[]& instanceName, Boolean flushCache, Boolean fSync, Boolean fParallel)
in System.Data.SqlClient.TdsParserStateObject.CreatePhysicalSNIHandle(String serverName, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Byte[]& instanceName, Byte[] spnBuffer, Boolean flushCache, Boolean async, Boolean fParallel)
in System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, Boolean withFailover)
in System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean withFailover)
in System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, SqlCredential credential, TimeoutTimer timeout)
in System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, SqlCredential credential, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance)
in System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData)
in System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
in System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions)
in System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
in System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
in System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
in System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
in System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
in System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
in System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)
in System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
in System.Data.SqlClient.SqlConnection.Open()

Answer 1

I had the same problem. Lavasoft was also a reason. I checked in Program and Features if there is any Lavasoft program, and I was surprised to find application called WebCompanion of Lavasoft. I also found a running service LavasoftTcpService.

1. I stopped the service LavasoftTcpService (from services.msc)
2. I uninstalled WebCompanion from Program and Features.
3. Two above mentioned dlls (LavasoftTcpService.dll and LavasoftTcpService64.dll in C:WindowsSystem32 and C:WindowsSysWOW64) were still there. I changed their name, and a problem dissapeared.

Before those steps I tried to only change dlls names and there was a problem to resolve localhost: instead of 127.0.0.1 system was looking for 0.0.0.0. Ping was giving me an error message "Ping request could not find host localhost. Please check the name and try again"

3 steps resolved the problem.