c# - Crystal reports: Login failed for user '....' -


i have desktop application developed visual studio 2010, crystal reports, , dot net version 4. application installed on server sqlserver 2008 database , shared on domain network. on client side crystal report shows login information(sql authentication) server. once information provided works 2 3 times , shows "login failed user ....". went services panel on server , restarted mssql service. problem resolved again after 2 attempts shows same error message. there way resolve problem instead of keeping on restarting mssql service

sql server 2008 r2
dot net v4
ms vs 2010


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