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Symptoms and causes of Telnet failure

Source: Internet
Author: User
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ProgramRun normally in RedHat, but the user cannot connect after restarting RedHat. Use the Telnet command and the result is:

[Root @ tcsd-HP02 ~] # Telnet 192.168.1.21 8873
Trying 192.168.1.21...
TELNET: connect to address 192.168.1.21: No route to host
TELNET: Unable to connect to remote host: No route to host Instead of (when the port is not opened) [Root @ tcsd-HP02 ~] # Telnet 192.168.1.21 88722
Trying 192.168.1.21...
TELNET: connect to address 192.168.1.21: Connection refused
TELNET: Unable to connect to remote host: Connection refused So Speculation is the cause of the firewall After the firewall is closed, it is done. Previously, the firewall was manually closed. After the firewall was restarted, it opened again.

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