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Old 09-19-2012, 11:45 AM   #1
TheGene
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pc cannot access server at all


Hi everyone...


I use CentOS 6.3 with ProFtp and Webmin installed... Today I was trying to get another ftp user working and then my access to server died completely. I get ABSOLUTELY nothing at all from server on any port on my pc... yet the other pc's on the lan can connect and do anything at all on the server... On this one there is no local or web acces...

pls can u point me at a solution?
 
Old 09-19-2012, 02:31 PM   #2
MensaWater
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Clearly the issue is either the PC itself or its connection to the network the rest of the PCs are on.

So what are you running on the PC. (Windows? Linux? Mac? what version?)

How is the PC connected to the rest of the network?

Can the PC get to anything else on the network?

Are the other PCs and this one in the same subnet?
 
Old 09-19-2012, 02:56 PM   #3
TheGene
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PC runs Win 7, all internet access etc. works perfectly, all other PC's on the LAN run WIN 7 and can be accessed perfectly, everything is connected via router wired and wireless...the only access NOT working AT ALL is to the server... I suspect the server of cutting the comms because all the other pc's on the lan can access it...

Is there not some security setting for ftp or likewise that can disable communication temporarily or permanently to a specific IP? I mean in centOS itself...

Last edited by TheGene; 09-19-2012 at 03:02 PM.
 
Old 09-19-2012, 03:19 PM   #4
JaseP
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Blocking IP addresses?! Absolutely such a thing exists,... IPtables...

But I'm guessing the real problem resides elsewhere,... like in the user configuration utilities of one of those packages.

Is the centos machine the DHCP server (probably not, as you say the machine can connect to the internet)?

Last edited by JaseP; 09-19-2012 at 03:23 PM.
 
Old 09-19-2012, 04:28 PM   #5
TheGene
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lol everyone in the www can connect and work... only my pc has no access whatsoever... no putty, no ftp, no transmission, nothing.... its not a general thing, it is very very specific only to this pc... as i said, i was trying to get a ftp user access working, the next thing i had NO access... wtf???
 
Old 09-19-2012, 06:32 PM   #6
JaseP
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What asigns the IP address to the bad Win7 machine on the lan? The Centos server or a router (with its DHCP server turned off, if the centos server is the lan's dhcp server)?


If you force a change to the IP address of the bad Win7 machine does it connect? Also, are you using fail2ban?

Last edited by JaseP; 09-19-2012 at 06:41 PM.
 
Old 09-19-2012, 07:12 PM   #7
JaseP
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Think I found it... A rule was likely created in IP tables to block that user... In the Webadmin module for proftp,... you want to look for an menu option or icon for denied FTP users. Remove your blocked user from that.
 
Old 09-20-2012, 12:36 PM   #8
TheGene
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The IP is assigned via my ISP to the router, and that gives an addy of 10.0.0.100/99 to the devs that connect to it... the server for example returns ifconfig of 10.0.0.105, and this machine 10.0.0.101... if the ip is force changed the router does NOT speak to it anymore.... and the ftp tables is not the problem, there is NOTHING there... or in the iptables either....
 
Old 09-24-2012, 03:09 PM   #9
JaseP
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That address is an internal address for commercial Cisco routers... The outward facing IP address is something else. So the router is running the DHCP server for the LAN, or setting the IP addresses statically...

I'm still convinced that the user is blocked by ProFTP, and that the way to fix it is in the ProFTP web admin utility (from another machine, obviously).

One thing that's peculiar is that the local machine's IP is lower than the server. The services on the server may be configured to look at IP addresses in a range, and yours may fall outside it. Can you even SEE your local machine from the server or other machines on the LAN? Are the IP addresses assigned statically, or assigned by DHCP?
 
Old 09-26-2012, 01:28 AM   #10
TheGene
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The router is not a Cisco btw... but the router is running the DHCP, and the addy for this machine would be lower, as it was connected to the router at an earlier date than the server, and addresses are allocated on a fcfs basis.... There is absolutely NO blocking being done by proftp at all... and I cannot see THIS machine at all from the server, yet the others are there...

But, be that as it may, I could'nt carry on like this, so I dumped the seedbox off, lol 734GB... and re-installed the server from scratch yesterday.... I have IMM access to everything again... so the problem was not router related, definitely at server side.... lets hope it does not recur again, thanks all for trying to help....
Just weird that I could not find anything in any of the blocklists or even in the syslog at all...
 
  


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