anthony.green (11/18/2015)

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1- Length specified in network packet payload did not match number of bytes read; the connection has been closed. Please contact the vendor of the client library. [CLIENT: 192.168.128.76]

Whats the client library, is it 3rd party, have you spoke to them

ado.net

2- SQL Server could not spawn FRunCommunicationsManager thread. Check the SQL Server error log and the Windows event logs for information about possible related problems.

What does the error log and event log say?

these are errors which are related to MSSQL in eventlog

3- Could not start the network library because of an internal error in the network library. To determine the cause, review the errors immediately preceding this one in the error log.

What does the error log and event log say?

these are errors which are related to MSSQL in eventlog

4-TDSSNIClient initialization failed with error 0x50, status code 0x1. Reason: Initialization failed with an infrastructure error. Check for previous errors. The file exists.

Not using SSL certs to encrypt client traffic between client & server are you? If so has the cert expired? If you remove SSL from the SQL config does it work?

What previous errors are there in the error and event log?