No Host Available

Am getting following error, when I run queries using cqlsh. Please help me to resolve this error.

'NoHostAvailable - ('Unable to connect to any servers', {'10.xx.xx.xx:9042': error(24, "Tried connecting to [('10.xx.xx.xx', 9042)]. Last error: Too many open files")})'] (will try again later attempt 3 of 5)

But I don’t see Too many open files error in logs.

Try increasing the open-file limit on your server.