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Questions tagged [blocking]

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Server blocking after enabling ufw

I recently leased a Ubuntu 22.04 VPS server from a data centre in France. My office PC that links to this server is in Ireland. My mobile internet IP seems to be static, i.e. it is the same from day ...
Trunk's user avatar
  • 103
0 votes
1 answer
87 views

Postfix check_sender_access not blocking certain addresses

I keep getting spam emails from 'ional.co.uk'. I've got an address based blocking solution which handles all other emails just fine, but somehow this domain keeps getting through. Full files I can add ...
Sarazil's user avatar
0 votes
0 answers
22 views

Blocking WhatsApp traffic from a specific Country [duplicate]

How can a country block all WhatsApp traffic from a specific country?
Yaseen Khan's user avatar
0 votes
1 answer
762 views

How to check if a process is running or blocked on lock or I/O?

There are 2 instances of a script reported by ps. How can I see in the command line if one of those (and which) is blocked on either I/O or on a file lock?
Jim's user avatar
  • 109
0 votes
0 answers
169 views

Restrict access to server for TOR and VPN users

Is this possible to restrict access to all users, who try to connect to my web server using TOR or VPN? I'd like to geoblock some users and also want to avoid them accessing my website even if they ...
Geckon01's user avatar
0 votes
1 answer
618 views

Returns of UDP packets are discarded

I use High avaibility pfSense 2.6.0 cluster and I strange behavior with UDP when use Discord voice channel. In fact, discord voice channel display "No route" and traffic analysis paquets ...
Isopote42's user avatar
  • 157
1 vote
0 answers
709 views

Possible STP Issue with Cisco SG350 Switches

we are having a weird issue with a network of Cisco SG350 Switches that I cannot figure out. We are thinking it may be related to STP but have verified all the normal problem points (i.e. proper ...
devGuru's user avatar
  • 11
0 votes
1 answer
865 views

After USBGuard having blocked all USB devices including keyboard, is there any way to stop the service?

After USBGuard having blocked all USB devices including keyboard, is there any way to stop the service? Or will I need to reinstall the system as it is rendered unusable if it is not remotely ...
kaiya's user avatar
  • 101
2 votes
1 answer
4k views

NGINX block location access and redirect to custom error page

I have a issue with my NGINX setting with redirecting to a custom error page on another location (incl. css, images, js) if a error page should be thrown. At first I would like to block access to an ...
devKyrios's user avatar
0 votes
0 answers
470 views

Bind/Fail2ban how to reject requests from certain domain

Today I got my VPS stucked. Centos 7, 4 cores, Bind 9.11. From ssh I got Message from syslogd@host at Jul 18 09:46:16 ... kernel:NMI watchdog: BUG: soft lockup - CPU#0 stuck for 41s! [f2b/observer:...
Daniel Franco's user avatar
1 vote
1 answer
3k views

How can I block all IPv6 Adresses starting like this 2a01:598:xxx in my .htaccess file?

How Can I block all IP Adresses that start like this 2a01:598: in my htaccess file? I tried: Deny from 2a01:598::/28 and i also tried it like this: Deny from 2a01:598:: But it doesnt work? What ...
Benjamin S's user avatar
1 vote
1 answer
238 views

Alter database blocked by -2

We have a database that we can't restore because any alter database to put it into single_user mode (or offline) will fail because it is blocked by a distributed transaction. sp_lock -2 shows the ...
AndrewSchmidt's user avatar
1 vote
1 answer
1k views

block website for a specific Mac address - lede firmware router [closed]

I am trying to block specific websites/urls in my home network only for specific users / Mac addresses, is this at all possible? I have a Linksys WRT 1900 WRT v2 router running LEDE, a varient of ...
Ess Tukay's user avatar
1 vote
1 answer
320 views

how to disable a spcific cgi page in apache?

I have an Apache server that hosts multiple sites, one of them use CGI, one of them does not. While security scanning this non-CGI site was flagged in the tool for security review for a CGI page. I ...
Diadems's user avatar
  • 26
2 votes
1 answer
1k views

What firewall settings need to be used to block Microsoft Telemetry (spyware)?

I'm seeing a lot of products, such as SQL Server, coming out with opt-out spyware. This is marketed as "Telemtry" or "Customer Experience Improvement Program (CEIP)". Can I disable the spyware in SQL ...
Evan Carroll's user avatar
  • 2,434
1 vote
1 answer
2k views

UFW doesn't block the mongodb port

I have blocked 27018 using ufw but still, I can connect to that port from my computer using mongo command line tool. is there any solution to this? I tried to run ufw reload but result is still the ...
nikoss's user avatar
  • 113
0 votes
1 answer
1k views

Meraki blocking js and css from good sites that use Cloudfront.net

We have a Meraki device in place that is blocking static resources (i.e. js and css files) from Cloudfront.net and causing problems with valid sites loading. One specific error (below) indicated it ...
EfficionDave's user avatar
2 votes
1 answer
899 views

Apache access.log flood with GET ...HTTP/1.1" requests

I have a server with Ubuntu 14.04, laravel 5.2 framework. On the last 24 hours somebody continously send flood requests from different ip adresses as shown below (log/apache2/access.log): 198.46....
Petres Arpad's user avatar
5 votes
2 answers
7k views

Squid Not Blocking SSL HTTPS Properly

So my goal here it to block only certain youtube channels. If I do: acl block_youtube dstdomain .youtube.com http_access deny block_youtube it blocks any access to youtube. if I do: acl ...
John's user avatar
  • 157
3 votes
0 answers
2k views

Block Bad Bots in Nginx for Multiple Sites

I need to block a bunch of robots from crawling a few hundred sites hosted on a Nginx web server running on a Ubuntu 16.04 machine. I've found a fairly simple example here (important part of the ...
Sledge Hammer's user avatar
0 votes
1 answer
5k views

HAProxy - Multiple sites, multiple acl's

We are busy with setting up HAProxy. Almost everything is working, except setting it up without multiple sites with different acl's. What we want: Using HAProxy with multiple sites, all on the same ...
G. Kooistra's user avatar
1 vote
1 answer
540 views

is it possible to block a certain facebook or twitter account via firewall or proxy?

I would like to block/filter/censure certain social network users witch content may be offensive or violent, so that people inside my LAN ( say school ) will have access to the main site, for example ...
bashizip's user avatar
  • 113
0 votes
1 answer
169 views

MongoDB foreground index build blocks secondary reads for all databases

Today one of the users of our MongoDB 3.0.12 sharded cluster has (wrongly) issued a foreground index build on its own database (pride_archive_ms), after the operation completed on the primary member ...
user366221's user avatar
1 vote
1 answer
586 views

How to keep md-raid from blocking IO?

I run a server with md-raid (software) level 1 (2 HDDs mirroring) and several different applications run on it. The problem arises when file-intensive jobs (e.g. extracting large archives) run while ...
Cobra_Fast's user avatar
0 votes
1 answer
983 views

Watchguard blocking ports

I want to block the whole Internet for particular hosts. In this case I used policy 'Any" which basically blocks every single port (tcp+udp I believe). In FROM field I put particular IP address from ...
Kai's user avatar
  • 33
-1 votes
1 answer
611 views

How to block via Windows 2008 R2 firewall based on workstation's name?

over 8GB of traffic from a workstation named KHAOSSERVER has occurred since yesterday; in the Security Event Log are records like this: An account failed to log on. Subject: Security ID: NULL ...
gerryLowry's user avatar
2 votes
0 answers
848 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 (...
Manchego's user avatar
  • 121
0 votes
1 answer
160 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 ...
Tamás's user avatar
  • 9
1 vote
2 answers
625 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 ...
Borealis's user avatar
  • 155
4 votes
1 answer
4k 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 ...
Danny 's user avatar
  • 41
8 votes
4 answers
47k 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 reddit.com/r/foo/...
unsi's user avatar
  • 81
-3 votes
1 answer
4k 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 ...
Adrian Nica's user avatar
0 votes
1 answer
31 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 respond ...
Robin's user avatar
  • 1
2 votes
1 answer
75 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 ...
Sam Hendrickx's user avatar
1 vote
1 answer
154 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 ...
Marisol López's user avatar
9 votes
1 answer
12k 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 ...
raugfer's user avatar
  • 221
0 votes
1 answer
4k 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 ...
Doug's user avatar
  • 239
-6 votes
1 answer
225 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 ...
jain's user avatar
  • 101
1 vote
1 answer
4k 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.
user avatar
0 votes
2 answers
426 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 randomly,...
nuthan's user avatar
  • 131
-1 votes
1 answer
2k 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 ...
nasekt's user avatar
  • 1
1 vote
4 answers
25k 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 ...
George's user avatar
  • 183
5 votes
1 answer
4k 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 ...
inetplumber's user avatar
2 votes
2 answers
144 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 ...
Excalibur2000's user avatar
1 vote
0 answers
300 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 ...
Alex Edwards's user avatar
2 votes
2 answers
1k 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 ...
mseifert's user avatar
  • 439
3 votes
2 answers
20k 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 ...
Thomas Lomas's user avatar
-1 votes
1 answer
76 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 ...
rleir's user avatar
  • 372
-1 votes
2 answers
2k 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 ...
Flipper's user avatar
  • 99
0 votes
4 answers
5k 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 ...
Asche's user avatar
  • 101