Skip to main content

ubuntu - SSL connection refused



I'm getting "Connection refused" errors for some sites being served over SSL on my Ubuntu box (10.04 LTS). It doesn't affect all sites: https://github.com/, for example, loads no problem, but https://codeeval.com does not.



I've checked my firewall settings, and there are no rules affecting connection to sites over port 443. But running nmap yields the following:




$ nmap -sT -r -n -p443 codeeval.com

Starting Nmap 5.00 ( http://nmap.org ) at 2011-06-22 11:25 BST
Interesting ports on 184.72.48.116:
PORT    STATE  SERVICE
443/tcp closed https

Nmap done: 1 IP address (1 host up) scanned in 1.31 seconds



To check that it wasn't a problem with the site, I SSH'd into another computer on my local network and ran the same command, this time getting:



$ nmap -sT -r -n -p443 codeeval.com

Starting Nmap 5.00 ( http://nmap.org ) at 2011-06-22 11:37 BST
Interesting ports on 184.72.48.116:
PORT    STATE SERVICE
443/tcp open  https

Nmap done: 1 IP address (1 host up) scanned in 0.53 seconds



There's clearly something wrong with my local config, but I can't work out what might be causing it. I haven't been able to track down any meaningful log messages; the only response when I try to connect is "Connection refused."



Does anyone have any insight into what might be causing this?


Answer



Actually, I've found the solution. I followed the advice here - SSH Connection refused - which I assumed to be an unrelated problem.



Clearing the IP tables and resetting the rules fixed my problem.




EDIT - A follow up:



I've also determined what caused the problem, though I'm now looking for a long-term solution. It would seem that the changes made to my IP tables made by software called IPBlock persist even after the application process has ended. The only way I can seem to prevent this is by flushing the tables after I quit IPBlock. Does anyone have any better suggestions?


Comments

Post a Comment

Popular posts from this blog

linux - iDRAC6 Virtual Media native library cannot be loaded

When attempting to mount Virtual Media on a iDRAC6 IP KVM session I get the following error: I'm using Ubuntu 9.04 and: $ javaws -version Java(TM) Web Start 1.6.0_16 $ uname -a Linux aud22419-linux 2.6.28-15-generic #51-Ubuntu SMP Mon Aug 31 13:39:06 UTC 2009 x86_64 GNU/Linux $ firefox -version Mozilla Firefox 3.0.14, Copyright (c) 1998 - 2009 mozilla.org On Windows + IE it (unsurprisingly) works. I've just gotten off the phone with the Dell tech support and I was told it is known to work on Linux + Firefox, albeit Ubuntu is not supported (by Dell, that is). Has anyone out there managed to mount virtual media in the same scenario?
Post a Comment
Read more

ubuntu - Monitoring CPU, Mem, disk, on a single server

I've been looking for a simple starter solution for monitoring my [currently] single server hosted solution. Other than Nagios and similar, are there other good (simple) solutions people are using? Answer Everything depends on what you want. For example Munin is very simple, you can install and configure it in less then 10 minutes (on one server), it can sends alarms, make graphs from monitoring cpu, mem. apache connections, eaccellerator, disk io and many many more (it has many plugins). But if you are planning in future get some more machines, munin may not be enough. For example in munin you cant monitor state of individual processes, can't monitor changes in files (for security purpose). So if you wanna only see what is the utilization of basics parameters on your server and don't plan to buy some more servers Munin is what you are looking for, but if you wanna be alarmed when some of your service is down, take more control on what is happeninig on...
Post a Comment
Read more

hp proliant - Smart Array P822 with HBA Mode?

We get an HP DL360 G8 with an Smart Array P822 controller. On that controller will come a HP StorageWorks D2700 . Does anybody know, that it is possible to run the Smart Array P822 in HBA mode? I found only information about the P410i, who can run HBA. If this is not supported, what you think about the LSI 9207-8e controller? Will this fit good in that setup? The Hardware we get is used but all original from HP. The StorageWorks has 25 x 900 GB SAS 10K disks. Because the disks are not new I would like to use only 22 for raid6, and the rest for spare (I need to see if the disk count is optimal or not for zfs). It would be nice if I'm not stick to SAS in future. As OS I would like to install debian stretch with zfs 0.71 as file system and software raid. I have see that hp has an page for debian to. I would like to use hba mode because it is recommend, that zfs know at most as possible about the disk, and I'm independent from the raid controller. For us zfs have many benefits, ...
Post a Comment
Read more