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I have a few VMs on a XenServer. One is a RHEL 8.7 running SSH server. Another is a Rocky Linux 8 client and also some other Ubuntu and Windows systems. The Ubuntu and Windows systems can telnet to the RHEL server just fine. The Rocky VM cannot. All static IPs with firewalls disabled. The Rocky system can ping the RHEL machine but not telnet. It just says "Trying " and then fails after a couple minutes stating "Connection timed out"

Any suggestions? Any log files I can check?

Thanks!

techguy817
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  • Telnet or `ssh`? Because these protocols are different! – Romeo Ninov Aug 01 '23 at 19:04
  • Trying to telnet. Telnet . – techguy817 Aug 01 '23 at 19:05
  • Is it telnet server started on the target machine? Have you try from Rocky `nc 23`? – Romeo Ninov Aug 01 '23 at 19:07
  • The telnet server is started on the target RHEL machine. Again I can connect just fine from Ubuntu and Windows clients using telnet. Result of `nc 23` is also "Connection timed out" This Rocky VM is able to telnet to google.com 80 just fine though. – techguy817 Aug 01 '23 at 19:09
  • Have you try to `ssh` from Rocky to target? And just check again the firewalls on Rocky and target – Romeo Ninov Aug 01 '23 at 19:12
  • 'ssh ' fails with 'Connection timed out' on Rocky Linux to RHEL. I have run 'systemctl stop firewalld' on both machines. – techguy817 Aug 01 '23 at 19:18
  • Are they connected to the same IP network, same netmask, have same default gateway set. And are they connected to the same virtual switch in XEN? – Romeo Ninov Aug 01 '23 at 19:25
  • Same IP network and same gateway set. All on the same network segment so shouldn't need to reach out to the gateway. Really strange... – techguy817 Aug 01 '23 at 19:29
  • Please check again in XEN if they are attached to the same virtual switch (or whatever it is named) and if you do not have there some filters – Romeo Ninov Aug 01 '23 at 19:31
  • Yes it is all the same VM network. I am able to ping from the Rocky Linux client to the RHEL server just fine. – techguy817 Aug 01 '23 at 19:33
  • Not sure if it helps but if I do 'telnet 80' it immediately comes back 'Connection Refused' vs the timeout if I use another port like the default. – techguy817 Aug 01 '23 at 19:34
  • Let us [continue this discussion in chat](https://chat.stackexchange.com/rooms/147604/discussion-between-techguy817-and-romeo-ninov). – techguy817 Aug 01 '23 at 19:44

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