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1
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0answers
23 views

determine if threads on a cpu are blocked? What are the causes of thread blocks?

The load-average reported by uptime command also displayed in top provides the the average run-queue length over time (1, 5 and 15 minutes) The run-queue length is the sum of the number of threads ...
0
votes
1answer
48 views

Got blocked by server after starting TCP nodejs sever. Why?

I recently installed node on my VPS, and tried to complete a tutorial. I saved this code into server.js and hit node server.js in putty. I got instant "ban" from my VPS, I can't access it, however on ...
1
vote
2answers
49 views

How to lock Windows Server 2008 R2?

I have a virtual server running Windows Server 2008 R2. There are approximately 4 users of the virtual machine that access the machine via RDS. I have noticed several instances where multiple users ...
2
votes
0answers
137 views

How do iptables work with NFQ in terms of traffic shaping in snort?

I'm trying to understand how iptables and NFQ work together with snort. The reason that I ask this is because from what I understand snort can be set to IPS via NFQ but if you have iptables there ...
0
votes
0answers
73 views

How to block external sites using squid as forward proxy

I'm currently blocking sites using an acl, i.e.: acl block_site dstdomain "/etc/squid3/blocked". That works great, however, I'm wondering if it's possible to also block all external domains? For ...
0
votes
1answer
210 views

Allow a certain URL path with Squid

I'm using Squid 3.4 on Debian, and I want to know how to allow certain sub-URLs while banning the rest of them. Particularly, I want to ban access to reddit.com/* but allow access to ...
-3
votes
1answer
106 views

iptables rules for blocking specific packets [closed]

Im using the following iptables rule: iptables -A INPUT -p tcp -m tcp --tcp-flags PSH,ACK PSH,ACK -m length --length 52 -m state --state ESTABLISHED -j DROP It does it's job for blocking the ...
0
votes
1answer
16 views

Apache2: How can I get Apache2 to not respond?

I didn't find a way but it can't be so hard : How make Apache2 Listen a port but not responding. My VH: <VirtualHost *:80> ServerName catchall </VirtualHost> I don't want to ...
2
votes
1answer
42 views

Block traffic to certain servers

In my organization, I'd like to make sure all servers are only accessible from the inside. The only exceptions are the mail and webservers. What's the best way to do this? My own suggestion was ...
1
vote
1answer
58 views

User blocked in AD by some windroid device

We have a user that is constantly blocked. We checked the logs in the domain controllers and all the information shown is that a WINDROID device is the source. How can I know which device is causing ...
4
votes
0answers
546 views

Haproxy: reject traffic by user agent from file

I am trying to reject connections from specific user agents (by matching a substring of the user-agent header) using an haproxy ACL with -f option to read from a file. However it is not working, it ...
0
votes
1answer
81 views

Is it possible to block HTTP traffic from specific machines?

I have some web crawlers, and a specific website seems to be blocking traffic temporarily after some time. The thing is, even though all clients have the same external IP address (they access the ...
-6
votes
1answer
88 views

Block EXE in a machine [closed]

How can i block all executables in a machine unless i verify it. I have multiple clients and i want to do it as programatically (I am using Visual-Studio-2010). It can be done through registry using ...
0
votes
1answer
393 views

Block empty user-agents nginx?

My site was under attack and I noticed all the user agents are blank. How can I block this with my nginx? I have no idea what to block, if this is an empty user agent or what.
0
votes
1answer
107 views

Apache not serving static content concurrently

When tried to open multiple pages from Codeigniter based custom CMS on different tabs, the first tab loads, while the subsequent tabs wait for the first tab to complete, then sequence follows ...
-1
votes
1answer
382 views

How to block videos by title on youtube using Squid?

For example,i want to block videos that contain the word "cat" in the title. I also do not want the blocked videos appearing in: -Recommended Channels tab -Recommended/related videos -Search ...
0
votes
4answers
19k views

Fix/Bypass “Cannot connect to the real website-blocked” error in Google Chrome with OpenDNS blocking

Tl;Dr: How do I stop chrome from refusing to load pages that are blocked by OpenDNS, where the server has explicitly requested HTTPS? Long question: I have a large problem with Chrome in my ...
0
votes
0answers
852 views

How can I block “zenmate” plugin from Windows Server 2008 VM?

I am curious as to how I can block people from accessing my websites using the "Zenmate" Google Chrome extension? The sites are hosted on Windows Server 2008. These people are using the extension for ...
4
votes
1answer
724 views

How to check if a process is non-blocking in linux without using a stack tracer?

A multi-cpu server is running several processes. One process has a thread that should always be in a spinning state, using 100% of the CPU it's been assigned. My current method (besides asking the ...
2
votes
2answers
83 views

Can I restrict access to an apache website to a client whose IP address is on an ISP who allocates IP addresses via DHCP?

I have a website which I want to use for administrative purposes. I need to be sure that only people from certain machines can log on. the problem is they are on ISP networks. Will I truely get the ...
1
vote
0answers
106 views

Apache Bot Blocking when using <Location> element

I was looking through my access logs today and concluded I should probably make an effort to deal with bad traffic. I am trying to use this list (https://github.com/bluedragonz/bad-bot-blocker) as as ...
2
votes
2answers
306 views

Rejecting traffic where ACCEPT header is empty on favicon.ico requests

As part of filtering out potential harmful traffic, I currently reject traffic where $_SERVER["HTTP_ACCEPT"] is empty. I notice from my logs that a fair number of requests have been rejected due to ...
1
vote
2answers
2k views

MySQL SELECT query hangs

On my server I have 6 MySQL databases. They all power Wordpress websites. For some reason, 2 of these databases are not accessible. To my knowledge they use INNODB, but I can't confirm it as even ...
-1
votes
1answer
45 views

statistics on port 22 blocking [closed]

What are the statistics on port 22 blocking by firewalls in small and medium sized enterprises? We have a product that a customer installs on a PC, which communicates via ssh to our cloud server. It ...
0
votes
1answer
706 views

Allow visits only via domain, block by ip address

I am trying to block people from accessing my server via my ip address. Ideally I would like them to only be able to access it using my domain name. I have searched Google and unable to find ...
0
votes
0answers
455 views

Windows Server 2003 - Block outgoing traffic of program

I need to run a program on Windows Server 2003. I need all in AND out traffic to AND from this program to be blocked, EXCEPT if the origin/destination is 127.0.0.1. I have to only block this one ...
0
votes
3answers
436 views

Website filtering for OpenVPN clients

I am currently trying to block some websites by their domain names for all the clients of my OpenVPN server. My first idea was to use the /etc/hosts file. But, its effects seem to be limited to the ...
2
votes
3answers
3k views

Sonicwall App Control Advanced

I have a custom application that accesses a remote range of IP addresses, lets say for example 206.0.0.0 - 206.255.255.255, this is UDP based traffic. The issue is, Sonicwall NSA has been configured ...
1
vote
1answer
2k views

Block SSH access from specific countries

I found this handy script online, and would like to modify it to only block SSH access but I don't know anything about iptables and Im afraid Ill kill my system as i have no physical access to it. ...
0
votes
1answer
170 views

How to check what process is blocking local linux server (Slackware)

I have a Slackware linux server at my work. This is network, database and web server. Our main web application is used as a backend application to administrate our public website (which is frequently ...
0
votes
1answer
119 views

Is there a chance to block images spiders / bots on dedicated servers without using robots.txt or .htaccess?

We know that we can block certain spiders from crawling websites pages using robots.txt or .htaccess or maybe via the Apache configuration File httpd.conf. But that requires to edit may be a large ...
1
vote
2answers
380 views

How to diagnose Windows hangs - which resource is blocked?

We have a Windows 7 Pro machine running Apache/php/postgres processing Ajax requests under a constant load (several every second). Its also running various other applications, which perform lots of ...
0
votes
1answer
77 views

How to block access from all hosting services? (like gutenberg.org) [closed]

gutenberg.org blocks access to all hosting services as per http://www.gutenberg.org/error403.php How to achieve this? Is there a list of hosting ips? Also, would these be added to CSF?
3
votes
1answer
494 views

Apache IPv4 deny directive blocks IPv6 addresses

Edit I have thought that excessive number of "deny" lines are confusing apache into blocking unlisted IPv4 addresses. But comment of @Ladadadada made me pinpoint the exact issue. You can read my old ...
0
votes
1answer
196 views

Debian Dmesg Error - What does this output mean regarding an outage on eth1?

The tale of the NIC that quit; I have chucked the end of dmesg output from a server into pastebin; This server (PowerEdge 1850) has two NICs, eth0 and eth1. eth1 has a couple of VLANs defined on it, ...
0
votes
1answer
129 views

Blocking websites on Windows OS machine: registry vs firewall

When attempting to block a particular website (e.g. www.facebook.com) on a Windows XP 64bit Professional SP3 machine there are a number of methodologies that can be employed. Some methods are clearly ...
0
votes
1answer
1k views

Nginx php-fpm pool being blocked and stop responding

I'm having some issues with requests for pages not getting a response after requests take a long time to process. I have nginx setup to use php-fpm. I have two pools setup in PHP-FPM. One pool for ...
-5
votes
1answer
82 views

Services and protocols to restrict torrent traffic at a university campus [closed]

Which service has the ability of blocking bit-torrent traffic on a subnet network, snmp or bgp? Are these protocols useful for such blocking ?
1
vote
0answers
136 views

What can lock the only MySQL db process?

A plain old "delete single record" statement froze on me. Suspecting a (dead)lock issue, I checked the process list to see what blocks the delete. The delete statement was the only running db process ...
-1
votes
1answer
290 views

blocking search engine bots directadmin [closed]

I want to block some bad search engine bots like MJ12bot, YandexBot and Ezooms. We have like 200 users in the directadmin environment, and we want to install a "plugin" or "mod" to block those request ...
1
vote
1answer
3k views

Blocking requests from specific IPs using IIS Rewrite module

I'm trying to block a range of IP that is sending tons of spam to my blog. I can't use the solution described here because it's a shared hosting and I can't change anything to the server ...
0
votes
2answers
602 views

Can I use an IP-list include file for iptable blacklisting?

I would like to block all countries except mine in iptables, that is a list with about 100.000 Entries. How can I define this blacklist file in a script, so iptables blocks all those IP ranges? ...
1
vote
1answer
323 views

Intercepting/blocking outgoing emails from mailx + phpmailer

I was wondering if anyone knows of a way to ideally intercept (if not block) mailx from sending emails? The situation is that we have a development server (CentOS) that hosts the current version of ...
0
votes
2answers
1k views

Block port 25 on SBS 2003; allow Exchange

I know this is a noob question, but I haven't been able to find an answer on exactly what I'm looking for. My mail server was recently blacklisted due to being infected with cutwail. Part of the ...
5
votes
1answer
3k views

Block a website on HTTPS and allow it on HTTP (to enforce Safesearch)

I would like to block some websites on their HTTPS version and allow them on HTTP. The main websites involved are Youtube and Google Images/Videos. This is because on the HTTP version, I can enforce ...
0
votes
2answers
2k views

On a router, how do I block wan access for a particular machine without blocking its access to the local network?

On my tp-link TL-WR1043ND router I want to prevent a particular machine from having access to the WAN while still allowing that machine to access other machines on the LAN. My assumption is that I ...
-1
votes
1answer
1k views

How to Block all websites except one website in a LAN?

How to Block all websites except one website in a LAN of Ubuntu 11.10 Clients ?
3
votes
3answers
5k views

Separate Nginx access log file for certain requests only

As far as I can see Nginx supports by default 2 log files: error_log (tracks issues related to the Nginx server itself) and access_log (tracks requests processed by Nginx). Whilst it is possible to ...
1
vote
1answer
327 views

How to block the Java installer?

We send PC's out to customers that need a very specific version of Java installed; specifically 6.26. I already disable the Java updater but I was wondering if I could block the customer from ...
1
vote
3answers
194 views

IPTables not blocking some connections

I am using IPtables for a basic firewall, I have placed some blocks on those IP's attempting FTP, SSH conenctions, etc. I have accept rules at the top for good measure to ensure that my monitoring ...