How can I solve the issue of not being able to access the Hadoop web page?

If you are unable to access the web page of Hadoop, you can try the following solution:

1. Check if the Hadoop services are up and running: Make sure that the relevant Hadoop services have been started correctly. You can use command line tools such as jps or ps -ef | grep java to check if the Hadoop processes are running.
2. Check network settings: Ensure that the network settings are correct and that you can access the hosts of the Hadoop cluster in the network. Attempt to check the reachability of the Hadoop hosts by using the ping or telnet command.
3. Check the firewall settings: ensure that the firewall allows access through Hadoop’s web ports if it is enabled. By default, Hadoop’s web pages use ports 50070 (HDFS) and 8088 (YARN).
4. Check the Hadoop configuration files such as hdfs-site.xml and yarn-site.xml to ensure that the configurations are correct. Pay special attention to the dfs.namenode.http-address and yarn.resourcemanager.webapp.address settings to ensure that they point to the correct host and port.
5. Check the log files: review the log files of Hadoop, usually located in the Hadoop log directory, to see if there are any related errors or exceptions.
6. Restart the Hadoop service: Trying to restart the Hadoop service can sometimes resolve temporary networking or configuration issues.

If the above method does not work, more error information can be provided for further troubleshooting and resolution.