Hello,
from no reason, probably after some update.. I have this error shown and I am not so clever from the log file also!.
Can you please have a look?
The database is running fine, password, login, port is OK.
i have no idea what else 
Hosted on 2016 server
log file:
2019-02-15 10:12:49,376 WARN [C3P0PooledConnectionPoolManager[identityToken->1hge135a01uosxe315jhus3|ce649ea]-HelperThread-#1] [mchange.v2.resourcepool.BasicResourcePool] log Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@5a4d714c is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests.
2019-02-15 10:12:49,376 WARN [C3P0PooledConnectionPoolManager[identityToken->1hge135a01uosxe315jhus3|ce649ea]-HelperThread-#0] [mchange.v2.resourcepool.BasicResourcePool] log com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@1b89b3e1 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:
com.microsoft.sqlserver.jdbc.SQLServerException: Login failed for user 'Confluence'. ClientConnectionId:abe1bd6b-664e-467c-a19c-3cce34ce72e3
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:260)
at com.microsoft.sqlserver.jdbc.TDSTokenHandler.onEOF(tdsparser.java:256)
at com.microsoft.sqlserver.jdbc.TDSParser.parse(tdsparser.java:108)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.sendLogon(SQLServerConnection.java:4507)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.logon(SQLServerConnection.java:3374)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.access$100(SQLServerConnection.java:85)
at com.microsoft.sqlserver.jdbc.SQLServerConnection$LogonCommand.doExecute(SQLServerConnection.java:3338)
at com.microsoft.sqlserver.jdbc.TDSCommand.execute(IOBuffer.java:7342)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(SQLServerConnection.java:2688)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:2236)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:1897)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectInternal(SQLServerConnection.java:1738)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:1062)
at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:572)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1138)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1125)
at com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44)
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1870)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696)
2019-02-15 10:12:49,376 WARN [C3P0PooledConnectionPoolManager[identityToken->1hge135a01uosxe315jhus3|ce649ea]-HelperThread-#0] [mchange.v2.resourcepool.BasicResourcePool] log Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@5a4d714c is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests.
2019-02-15 10:12:49,376 WARN [C3P0PooledConnectionPoolManager[identityToken->1hge135a01uosxe315jhus3|ce649ea]-HelperThread-#2] [mchange.v2.resourcepool.BasicResourcePool] log com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@44f3a8fb -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:
com.microsoft.sqlserver.jdbc.SQLServerException: Login failed for user 'Confluence'. ClientConnectionId:f3df2578-397f-435d-aac4-70820591187d
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:260)
at com.microsoft.sqlserver.jdbc.TDSTokenHandler.onEOF(tdsparser.java:256)
at com.microsoft.sqlserver.jdbc.TDSParser.parse(tdsparser.java:108)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.sendLogon(SQLServerConnection.java:4507)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.logon(SQLServerConnection.java:3374)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.access$100(SQLServerConnection.java:85)
at com.microsoft.sqlserver.jdbc.SQLServerConnection$LogonCommand.doExecute(SQLServerConnection.java:3338)
at com.microsoft.sqlserver.jdbc.TDSCommand.execute(IOBuffer.java:7342)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(SQLServerConnection.java:2688)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:2236)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:1897)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectInternal(SQLServerConnection.java:1738)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:1062)
at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:572)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1138)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1125)
at com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44)
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1870)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696)
2019-02-15 10:12:49,376 WARN [C3P0PooledConnectionPoolManager[identityToken->1hge135a01uosxe315jhus3|ce649ea]-HelperThread-#2] [mchange.v2.resourcepool.BasicResourcePool] log Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@5a4d714c is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests.
2019-02-15 10:12:49,391 WARN [C3P0PooledConnectionPoolManager[identityToken->1hge135a01uosxe315jhus3|ce649ea]-HelperThread-#1] [mchange.v2.resourcepool.BasicResourcePool] log com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@48661f62 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:
com.microsoft.sqlserver.jdbc.SQLServerException: Login failed for user 'Confluence'. ClientConnectionId:6404b3bc-6105-4a32-8f55-5ec81b338030
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:260)
at com.microsoft.sqlserver.jdbc.TDSTokenHandler.onEOF(tdsparser.java:256)
at com.microsoft.sqlserver.jdbc.TDSParser.parse(tdsparser.java:108)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.sendLogon(SQLServerConnection.java:4507)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.logon(SQLServerConnection.java:3374)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.access$100(SQLServerConnection.java:85)
at com.microsoft.sqlserver.jdbc.SQLServerConnection$LogonCommand.doExecute(SQLServerConnection.java:3338)
at com.microsoft.sqlserver.jdbc.TDSCommand.execute(IOBuffer.java:7342)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(SQLServerConnection.java:2688)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:2236)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:1897)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectInternal(SQLServerConnection.java:1738)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:1062)
at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:572)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1138)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1125)
at com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44)
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1870)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696)
2019-02-15 10:12:49,391 WARN [C3P0PooledConnectionPoolManager[identityToken->1hge135a01uosxe315jhus3|ce649ea]-HelperThread-#1] [mchange.v2.resourcepool.BasicResourcePool] log Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@5a4d714c is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests.
2019-02-15 10:12:49,407 WARN [C3P0PooledConnectionPoolManager[identityToken->1hge135a01uosxe315jhus3|ce649ea]-HelperThread-#0] [mchange.v2.resourcepool.BasicResourcePool] log com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@29cbee2c -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:
com.microsoft.sqlserver.jdbc.SQLServerException: Login failed for user 'Confluence'. ClientConnectionId:869c41e5-cbed-4f97-a0b8-a9012abbf827
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:260)
at com.microsoft.sqlserver.jdbc.TDSTokenHandler.onEOF(tdsparser.java:256)
at com.microsoft.sqlserver.jdbc.TDSParser.parse(tdsparser.java:108)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.sendLogon(SQLServerConnection.java:4507)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.logon(SQLServerConnection.java:3374)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.access$100(SQLServerConnection.java:85)
at com.microsoft.sqlserver.jdbc.SQLServerConnection$LogonCommand.doExecute(SQLServerConnection.java:3338)
at com.microsoft.sqlserver.jdbc.TDSCommand.execute(IOBuffer.java:7342)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(SQLServerConnection.java:2688)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:2236)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:1897)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectInternal(SQLServerConnection.java:1738)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:1062)
at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:572)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1138)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1125)
at com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44)
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1870)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696)
2019-02-15 10:12:49,407 WARN [C3P0PooledConnectionPoolManager[identityToken->1hge135a01uosxe315jhus3|ce649ea]-HelperThread-#0] [mchange.v2.resourcepool.BasicResourcePool] log Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@5a4d714c is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests.
