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firewall or DNS issue?


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#1 cycle90210

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Posted 30 May 2015 - 10:26 PM

First time post here trying to get some new insight in to issues I am having accessing a host over my local network.

Setup is (real hostnames I've left out for simplicity. More simple to call them 1,2,3):

Asus Router (1GB connections)

TS140 server (Computer #1. W8.1 Enterprise)

TS440 Server (Computer #2. Server 2012 R2)

TS440 Hyper-V VM machine (Computer#3. Located on Computer #2 as a VM. W8.1 Enterprise).

 

 

All are wired connections within few feet/proximity.

All computers are domain joined to the domain controller (Computer #2).

Kaspersky EndPoint Protection is installed on all machines. 

"normal" things all work. I can ping all machines; RDP in to all machines; access network storage on all machines; 

The web access I am trying to utilize is a teampass install as well as a download client.

 

I am running in to issues when trying to access http://Computer3:8080 across the network. Chrome is giving me: ERR_CONNECTION_REFUSED

This is fine so I began to dig in to firewall issues. nmap confirms for me the ports are closed which ties in to the above error. Trying to pull out which pieces were affecting this I started as "small" as possible. Disabled all firewalls and still get connection refused.

Computer #1 I get this network error so I try to access it on Computer #2 (DC which is hosting the VM). Still errors out.  To confirm; I load:

http://localhost:8080 on Computer#3 and things work. Host is confirmed up and running. On Computer#3; if I instead access: http://computer#3.domain.com:8080  I will receive ERR_CONNECTION_REFUSED

 

This is where I am stuck. In what scenario on the machine running the host; does the localhost IP give me access but the actual computer IP address give me connection refused?

Seeing as localhost and computer IP on the same machine should resolve to the same destination; I don't understand the difference.

 

 



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#2 Kilroy

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Posted 31 May 2015 - 11:41 AM

If you can connect using http://IP_ADDRESS:8080 then if may be a DNS issue.  If you can't connect via IP address from another machine then your problem isn't DNS.



#3 Wand3r3r

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Posted 31 May 2015 - 11:25 PM

Usually you have to use https not http to gain access given 8080 is normally secured.



#4 Kilroy

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Posted 01 June 2015 - 05:07 AM

Port 8080 is simply a port redirect and does not always require https, which requires a certificate.  Since connecting with http to local host works, this is not the issue.



#5 Wand3r3r

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Posted 01 June 2015 - 10:05 AM

Good point of it works locally.  Not a dns issue either due to if local name resolution fails its resolved by broadcast.  Looking more like a firewall issue.

Kind of silly to do port redirection just for the sake of redirection.  I have never seen 8080 without being https.


Edited by Wand3r3r, 01 June 2015 - 10:07 AM.





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