We have 2 NAV 2009 Webservices, one for production and one for test, that has been working flawlessly for 10 years. A couple of days ago they were suddenly denied access to the SQL-server. We have checked credentials etc., and everything seems ok. Yesterday we got the access restored by restarting the whole server (restarting services did not work), but today any call to the services are rejected due to missing SQL access, and restart does not help. We have tried to deactivate Kaspersky security on both servers, but to no avail (Kaspersky has previously blocked legal ressources after updates).
The response given to the call: "The login failed when connecting to SQL Server SQL01."
Any ideas/suggestions will be appreciated.