redis.clients.jedis.exceptions.JedisConnectionException: Failed to connect to any host resolved for DNS name.

[nagesh-sys]

Expected behavior

Failed to perform put and get operations into Redis

Here is the stack trance

redis.clients.jedis.exceptions.JedisConnectionException: Failed to connect to any host resolved for DNS name.
	at redis.clients.jedis.DefaultJedisSocketFactory.connectToFirstSuccessfulHost(DefaultJedisSocketFactory.java:63) ~[jedis-5.1.2.jar:?]
	at redis.clients.jedis.DefaultJedisSocketFactory.createSocket(DefaultJedisSocketFactory.java:89) ~[jedis-5.1.2.jar:?]
	at redis.clients.jedis.Connection.connect(Connection.java:194) ~[jedis-5.1.2.jar:?]
	at redis.clients.jedis.Connection.initializeFromClientConfig(Connection.java:392) ~[jedis-5.1.2.jar:?]
	at redis.clients.jedis.Connection.<init>(Connection.java:67) ~[jedis-5.1.2.jar:?]
	at redis.clients.jedis.ConnectionFactory.makeObject(ConnectionFactory.java:59) ~[jedis-5.1.2.jar:?]
	at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:566) ~[commons-pool2-2.12.0.jar:2.12.0]
	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:306) ~[commons-pool2-2.12.0.jar:2.12.0]
	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:233) ~[commons-pool2-2.12.0.jar:2.12.0]
	at redis.clients.jedis.util.Pool.getResource(Pool.java:38) ~[jedis-5.1.2.jar:?]
	at redis.clients.jedis.ConnectionPool.getResource(ConnectionPool.java:29) ~[jedis-5.1.2.jar:?]
	at redis.clients.jedis.ConnectionPool.getResource(ConnectionPool.java:7) ~[jedis-5.1.2.jar:?]
	at redis.clients.jedis.providers.PooledConnectionProvider.getConnection(PooledConnectionProvider.java:68) ~[jedis-5.1.2.jar:?]
	at redis.clients.jedis.executors.DefaultCommandExecutor.executeCommand(DefaultCommandExecutor.java:23) ~[jedis-5.1.2.jar:?]
	at redis.clients.jedis.UnifiedJedis.executeCommand(UnifiedJedis.java:252) ~[jedis-5.1.2.jar:?]
	at redis.clients.jedis.UnifiedJedis.get(UnifiedJedis.java:730) ~[jedis-5.1.2.jar:?]

I configured the JedisPool like below

var redisHostName = System.getenv("REDIS_HOST");
		var redisPort = null !=  System.getenv("REDIS_PORT") ? Integer.parseInt(System.getenv("REDIS_PORT")) : 6379;
		var redisUserName = System.getenv("REDIS_USERNAME");
		var redisPassword = System.getenv("REDIS_PASSWORD");

		GenericObjectPoolConfig<Jedis> poolConfig = new GenericObjectPoolConfig<>();
		poolConfig.setMaxTotal(2000); // Set maximum number of connections
		poolConfig.setMaxIdle(300);  // Set maximum number of idle connections
		poolConfig.setMinIdle(100);   // Set minimum number of idle connections
		int timeout = 60000;
			        
		 JedisPool jedispool= new JedisPool(poolConfig, redisHostName, redisPort, timeout, redisUserName, redisPassword);

Redis / Jedis Configuration

Jedis version: 5.1.2

Java version: java 11

org.apache.commons : commons-pool2 2.12.0

[riham888]

we have the same issue:

down in the trace, caused by socket timeout:

so it resolves the Redis URL into an IP address and then tries to open a new socket which then fails with socket timeout...
running in Azure, Azure cache for Redis
it is jedis 5.1.0.

perhaps some kind of retry mechanism to be used?

[taylorbasso]

+1 same random error and stack trace. Will work fine for days and randomly get the error.

Interestingly, also using Azure Cache for Redis.

Jedis 4.3.2

[ggivo]

@taylorbasso @nagesh-sys

Based on the stack trace, a connect timed out error typically means the client couldn’t reach the Redis host — often due to DNS issues or network unavailability.

The exception message "Failed to connect to any host resolved for DNS name" was improved to include the contacted HostAndPort and detailed errors from each connection attempt (as suppressed exceptions). This should help clarify whether DNS resolution worked and why individual connections failed.

If needed, retry logic can be handled at the application level, or you can use RetryableCommandExecutor.

Without reliable steps to reproduce, I don’t think this issue is actionable at the moment.