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Jason Yu
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How to enable SSH access on a new installed centos 6.3 server

I installed a new centos server locates on DMZ zone. When I tried to putty it from my desktop on LAN zone, it gives me "Network Error: connection refused" . I am guessing that i need do some configurations for the putty protocol although I have already set up network card configurations. Please advise, thank you. I use IP address on the putty, so there is no dns problem involved here.
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Jason Yu

8/22/2022 - Mon
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Jason Yu

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Great, it works now. Thank you very much, woolmilkporc.

But I can't go to internet, even after I disabled the inbuilt firewall.

Do I need check the policies on my cisco PIX 505E firewall?

I tried to ping google.com, it doesn't give me responds.
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Jason Yu

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thank you for update, bad thing is my firewall is a Cisco PIX 515E, it doesn't have a GUI setup on my company. I used sonicwall for many years and get accustomed to GUI interface.

If i want to enable GUI on this device, how could I do it? I googled on line and says there is an application called asdm can manage cisco firewall. Do I need install this program or just use the IE to manage it.

please refer my another post at https://www.experts-exchange.com/questions/27975801/How-to-show-access-policy-and-forward-policy-on-Cisco-PIX-515E-firewall-device.html    for detail description of the issue, thank you.
Jason Yu

ASKER
Yes, I do want to access internet from this CentOS machine. It looks like the firewall blocked the outgoing traffics. Since I can log onto the intranet without any problem.




Do you mean going to Internet (http) from CentOS?

If so, you must open port 80 on the firewall between the DMZ and the outside world for the CentOS host.

If you want to ping Internet hosts you must allow ICMP request/reply packets on that firewall.
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Jason Yu

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I am sorry I don't have an account with Cisco, is there somewhere else I can download.

Or just use some commands on CLI to add some policies.

thank you.
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Jason Yu

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thank you very much, woolmikporc, I will update this afternoon. have a nice afternoon.
Jason Yu

ASKER
Great, I made it working, I can use ASDM to mange my PIX 515e now. wonderful job. Thank you very much woolmilkporc. I really appreciate your help.

if I want to permit the server on DMZ access Internet, is one access rule enough for doing this. Or do I need create other rules.

thank you.
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Jason Yu

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Good answers and solution.