I'm not sure on which kind of community to post this question, but as i thought it could be a bug, i'll take a chance.
Let me start with my situation. I've got a webserver (apache) running at home for over the last 3-4 years. First started off with Mandriva Spring 2011 release as OS, and as of this year moved over to Debian.
When running Mandriva the only situation when my server was unreachable was when i had it shut down manually. Since a few weeks i noticed that occasionally the server gets unreachable, while the pc which serves as server is still running.
When i reboot the pc, everything is back to normal and my website reachable.
I'm unsure whether it's true, but it seems to be that the server gets unreachable after an (uncertain to me) amount of time.
I am running Debian with Apache 2 and PHP5.
Could this be a known bug, ready to be squished?
[EDIT:]
Forgot to add the url to my website, here it is:
http://nannies.no-ip.org/~leden
Related
I recently had to reinstall IntelliJ IDEA, and ever since then, I've been unable to run this one app that runs on Payara. I have Payara 5.2022.3 (full) installed and the project is using java 11.
This is the server log:
Artifact my_project-ear:ear exploded: Waiting for server connection to start artifact deployment…
Detected server admin port: 4848
Detected server http port: 8080
And then nothing happens.
And if I terminate the process I get a message:
Application Server was not connected before run configuration stop, reason: Unable to ping server at localhost:4848
Based on my observation it seems like a process starts running on port 4848 for a few seconds but then stops abruptly.
I checked the CrashDumps and here is the .dpm file in question.
https://drive.google.com/file/d/1AyLU2HOyXKxREjaDNyIU9eRYMnzaBspw/view?usp=sharing
I'd already tried:
Running it on a different port./ Checking if there was not a process blocking used ports.
"Renewing" the domain.xml in case it was corrupted somehow.
Using different JDK.
Reinstalling Windows
I'm positive there is no problem with the app's code (seen a friend run it on his computer today) and I also think no changes happened to the run/debug configuration or the payara and domain configuration ever since it was working before the IDEA reinstall.
(I'm also very new to payara, and software development in general, so I'm not quite as skilled in solving this kind of problem.)
Thank you for all your answers.
It looks like a bug in the Java version/vendor you are using which is causing the crash of the process. Updating to a more recent Java build or to a different JVM vendor should help.
So I'm pretty new to the server and website dev. Self "taught".
I recently setup a home server running Apache on Ubuntu 20.04(MicroK8s, Linux Server). Postgres database. Nextcloud Cloud server. TomCat and OpenCMS system. And Postfix.
I have a domain name pointing to my address. When I'm home, i.e. physically near my server. And I connect to my subdomain. Cloud.example.com I get nextcloud. When I connect to the 8080 port(www.example.com:8080) I get tomcat and OpenCMS. So far, so good.
When I use a VPN, or am not near my server, and go to the subdomain,I sometimes get one of those random "ad" sites that says "this site may be able to purchase".
After more testing it seems like the number of connected users also changes whether I get the rando site or the intended one.
My server is... Old. Likely slow (4GBram and a Core 2 Duo, it's the fastest old tower I had laying around). So I think it's a timeout error within OpenCMS, that serves a rando site when it can't get nextcloud to respond fast enough. But honestly, I'm not even sure where to start, or what to even ask/say or what you would need to see to even start diagnostic...
When I connect to mydomain.com from the vpn i get a 404. Which makes sense, as I haven't built it yet in OpenCMS.
Any pointers on where to start?
What am I missing?
Do I need to delete my /var/www sites or Virtual Hosts, and let OpenCMS handle all the routing?
I'm confused as to how my server knows to point 8080 to tomcat/OpenCMS, as I never setup a virtual host. How will it eventually know to point mydomain.com to the sites I build in OpenCMS? Or will OpenCMS deploy them to /var/www? Will I need to transfer the netcloud site to the OpenCMS directory?
I know this is a lot of free help to ask for, but I'm doing this mostly for fun and to learn, and don't have anyone who knows. I don't want to pay it out as I'd rather learn it. I'm not even sure where to start asking, but have browsed stack overflow for A LOT of excel, Apache, Linux, and other answers in the past, so thought I would ask here first.
Backstory: A couple of years ago my group changed the server on which coldfusion runs to Apache instead of IIS. I changed my dev environment to run CF on Apache httpd and everything was fine. Later we changed the session variables to j2ee, but I have never been able to get j2ee to work on dev so I am still using regular session variables on dev. Lately I am getting session persistence failure on test but I can't reproduce on dev. In looking for differences in CF server settings between test and dev I discovered that test is running on Tomcat while dev is running on Apache httpd.
My problem real problem is how to get j2ee session vars to work on dev. My question right now is how do I change my server from Apache httpd to the Tomcat that is built in with CF 10? Is there a way to do this without starting over with a fresh install of CF 10 as those are the only instructions I can find?
System: Windows 7
IIS and Apache are not (for Coldfusion, anyway) application servers. They are your front-end web servers. Your 'application server' in this setup is the software running the "application" of Coldfusion via servlets, and that's Tomcat.
While it is possible to use CF's builtin Tomcat server as your front-end web server, it isn't advisable, and it's almost certainly got nothing to do with your problem. Apache is more than capable of doing what you need and a problem with J2EE session variables is going to be related either to your JVM (are you using more-or-less the same version as your production server?) or to Tomcat itself.
Think about how J2EE sessions work. A request comes in and hits your front-end server (httpd), which, presumabl through mod_proxy or mod_jk, hands that connection over to Tomcat. Until this happens, that your system is even running a JVM isn't relevant -- neither Apache nor IIS care about Java. I wouldn't go so far as to say that it's impossible for an Apache problem to be monkeying with your session variables, but it would be pretty low on my list of suspects.
Once Tomcat (and then CF) get involved, then your JVM is doing all the work, so that's where I'd look. I'd also have a look at CF logs and Tomcat logs.
To properly answer your question, though, if you want to remove Apache from the loop, you're looking at Tomcat's server.xml and web.xml in /cfusion/runtime/conf - you'd need it running on port 80 (or else reconfigure Apache to just pass all requests to Tomcat instead of only CFML, but that doesn't really do what you asked about since Apache is still involved). You'd also have to reproduce your entire Apache configuration in Tomcat, which I've never done and wouldn't recommend, but that's the direction you'd need to investigate.
Much better to work on solving your session problem. Killing Apache is just collateral damage here.
I have a google compute engine VM, running ubuntu, and utilising Laravel Forge.
I seem to get blocked by the VM after accessing SSH a few times (2-4), even if I'm logging in correctly. Restarting the VM unblocks me.
I first noticed the issue as I was having trouble logging into SSH, after a few attempts it would become unreachable. My website hosted on it also wouldn't resolve. After restarting the vm, I could try log into ssh again and my website works. This happened a couple time before I figured out how to correctly log in with SSH.
Next, trying to log in to the database with HeidiSQL, which uses plink, I log in fine. But it seems to keep reconnecting via SSH every time I do something, and after 2-4 of these reconnects, I get the same problem with the VM being unreachable by SSH and my website hosted on it being down.
Using SQLyog, which seems to maintain the one SSH connection, rather than constantly reconnecting like HeidiSQL, I have no problems.
When my website is down, I use those "down for everyone or just me" websites to see if it is down, and apparently it's just down for me, so I must be getting blocked.
So I guess my questions are:
1. Is this normal?
2. Can I unblock myself without restarting the VM?
3. Can I make blocking occur in a less strict way?
4. Why does HeidiSQL keep reconnecting via SSH rather than maintaining the one connection like SQLyog seems to?
You have encountered sshguard, which is enabled by default on the GCE Ubuntu images (at least on the 14.10 image, where I encountered it myself). There is a whitelist file at /etc/sshguard/whitelist.
The sshguard default configuration on my VM has a "dangerousness" threshold of 40. Most "attacks" that sshguard detects incur dangerousness of 10, so getting blocked after 4 reconnects sounds about right.
The attack signatures are listed here: http://www.sshguard.net/docs/reference/attack-signatures/
I would bet that you are connecting from an IP that has an invalid reverse DNS configuration (I was). Four connects like that and the default config blocks you for 20 minutes.
For well over a year and a half I have been running Apache (using HTTPD, naturally) through WAMP without issue, or at least no issues like this. On this system, we host around 8 or so different web sites and a few applications that use the MySQL database.
Recently I had a full system crash and when I rebuilt the system on the same operating system with the same versions of Apache, MySQL, and PHP and near-identical configuration files.
The issue I am having is this: On startup our web services initially seem to work fine, and this can hold over for an hour or so, sometimes less, sometimes more. However after some period of time, all web sites suddenly become entirely unavailable, to include the localhost landing on the web server itself or any local browsing for that matter. Apache identifies as still running, remains listening on port 80, and has no abnormal access or error logs (to include in debug mode).
I've gone over this quite a few times, reinstalled WAMP and have interchanged different versions of Apache. Additionally I've vetted the configuration files compared to the old system and have ensured that the modules, extensions, and so on are the same as our previous version.
I would really appreciate any insight as I continue to rack my head over what might be causing this erroneous issue.
--
Some additional details and notes that might prove insightful.
I've ensured the firewall isn't an issue, plus that wouldn't explain the sudden downtime or downtime at the localhost.
A restart of just the Apache service tends to fix the issue, but only for a little while.
Because we host multiple web sites, we do use virtual hosts. They work fine when the system is up and I don't believe they are of issue.
The issue tends to result in indefinite "Waiting for host (site.com, localhost, etc.)".
When I reset Apache during that indefinite error, it then errors out with "The connection to site.com was interrupted.", so something is still running.
During these downtimes, httpd -d DUMP_VHOSTS is able to return the active virtual hosts.
Using ab -n 1000 site.com when the site is 'down', the following result occurs:
Benchmarking site.com (be patient)
Completed 100 requests
Completed 200 requests
apr_pollset_poll: The timeout specified has expired (70007)
Total of 216 requests completed
Add this into httpd.conf
EnableMMAP off
EnableSendfile off
AcceptFilter http none
AcceptFilter https none
This will disable Apache from using some of the more advanced functions for networking that the OS provides.
These functions can get broken with 3rd-party software installs.
Sometimes reinstalling TCP/IP (winsock) can remove the 3rd-party filters/drivers attached to the network layer.
netsh winsock reset