Questions tagged [block]

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boot block integrity verification failure [closed]

You have been provided access to a Compaq AlphaServer DS10L that you are told was running OpenVMS v7.3-2; the system is not running when you see it. Physical examination of the system shows that there ...
2
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1answer
78 views

IPTABLES - block IPs that do not complete handshake/visit webpage

i am trying to figure out how to achieve something am not sure is achievable and need help. I did my research but couldnt find credible information. Hope this question is not duplicate. SET UP: I am ...
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0answers
26 views

how to restrict users switching from su command

How can I restrict users switching by su command..? suppose there are 3 users (root,user1 and user2) only root and user1 can switch by using su command. root or user1 should not be able to switch to ...
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0answers
34 views

zfs mirror change block size without going offline

Got pretty old physical machine which is hard to put offline for long time or rebuild. It is under FreeBSD 9, and uses zfs to store data (including system). Don't know why, but it confured the way ...
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0answers
135 views

What setting causes openvpn client to log on connection: “block IPv4 DNS requests from other apps”?

What setting causes openvpn to block third party DNS request, the windows client logs on connection: block IPv6 DNS requests from other apps netsh interface ip set dnsservers 5 static 192.168.100.1 ...
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7answers
9k views

Government censors HTTPS traffic to our website. Workarounds?

I am helping run a website that has been blocked for political reasons by the same Russian agency that has previously tried blocking Telegram (RosKomNadzor). This is not the first time it happens, and ...
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0answers
97 views

Blocking encrypted emails attachments with Amavis

I'm having a problem with amavis on my Centos 7 machine (amavisd-new 2.12.0, postfix 2.10.1, ISPConfig Version: 3.1dev). I'm trying to configure amavis so that it discards emails with encrypted .zip ...
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1answer
115 views

Domain blocked by ISP

ISPs blocked my domain in one country. It redirects to an IP address that the ISP uses to block access to sites it blocks. (https://ispipaddress:8080/mydomain.com) The URL cannot be accessed directly, ...
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0answers
67 views

VMware esxi host partedUtil sector bit and block size?

Alright, things i did are: studying https://kb.vmware.com/s/article/1036609 and https://kb.vmware.com/s/article/2004299 , and also googled some other information about the "partedUtil" in ...
0
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0answers
27 views

How to reject attachments with accents - Postfix mime-header-checks

currently my Postfix mime-header-checks config are rejecting attachments from spammers, it's working, but today I discovered that messages with attachments that have accents in the file name can pass ...
0
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1answer
42 views

I cant block ACK packets going through port 80

I want to block nmap's ack ping probes and in order to do that, I fist need to block all incoming ack packets coming on port 80. I used this command but it didnt work: iptables -A INPUT -p tcp --dport ...
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0answers
30 views

How should I block traffic to destination port using iptables?

I have received an abuse from my server provider and one thing which is the same is that the target on destination IPs is the SMB (445) port . How can I block destination traffic to port 445 using ...
2
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0answers
29 views

duplicate block device and UUID

Today I ran fsck on two partitions of our Ubuntu 16.04 server. Fsck has fixed various problems and afterwards I rebooted the server. After rebooting there were duplicate block device assignments with ...
2
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0answers
144 views

Apache PHP REST API handle/block web attack attempts

We're currently running a PHP API (all URL's get rewritten to index.php for route-handeling) on an Apache Debian server. Edit: (I think I might have landed on the wrong StackExchange for this question,...
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0answers
46 views

Securing LDAP on Server (All Public IP's)

I bought a server from OVH (Dedicated) and install 3 VM's on Vmware 6.5. On server I configured AD and other are member servers. This a temporary serve to test some 3rd party app migrations. The ...
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1answer
43 views

Can nginx block ~20000 ips?

Can nginx block ~20.000 ips? And should i block ips (https://lists.blocklist.de/lists/all.txt) with nginx?
0
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1answer
41 views

Is there a way to block internet access using iptables for particular access points

In our company we have several access points. For some of them in the production area it should be disallowed to use them for accessing the internet. The router we have has (at least) two interfaces: ...
2
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1answer
421 views

In CentOS 7, is there a way to specify which block devices should be tuned with the scheduler (or ELEVATOR)?

In CentOS 6, there was /etc/tune-profiles/my-server/ktune.sysconfig with this text(I'm referring to the comments that explain what the code is doing): # This is the I/O scheduler ktune will use. ...
0
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1answer
754 views

How to Block a Domainname with random TLDs in Postfix?

Can anyone please tell me how to reject all domains with a particular name, but regardless of the TLD? I want to block all mail coming from domains named bulksender, like bulksender.com, bulksender....
1
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1answer
91 views

How to drop outgoing traffic based on matching string over HTTPS

I am managing a small shared hosting server. Today I received a complaint from my hosting provider that my server is sending out requests on wp-login.php pages of other websites elsewhere. I ...
2
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1answer
1k views

IP blocking with .htaccess in Apache 2.4 - Not Working

I want to block specific IP addresses but allow all others. I'm still struggling with this. First I modified the apache2.conf file to look like this: <Directory /var/www/> Options Indexes ...
-5
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2answers
105 views

Router's Parental Controls Really Block All Internet Traffics?

I am using Asus 4G-AC53U router. When I turn ON "Parental Controls" to block a client's Internet access, does the router really block ALL kinds of Internet traffics including system's service (such as ...
0
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1answer
127 views

Emails go to spam folder on email server with MS Exchange

Emails from redwerk.com email server goes in spam folder on server with MS Exchange. I had performed all kinds of server checkings (SPF, DKIM, Blacklists). Had performed checkings on https://...
0
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2answers
3k views

Performance of iptables

I would like to ask you what is performance of iptables. Let's say that I whitelist and blacklist some IP addresses, I block about 10 000+ IP addresses, so every IP is like new rule. I don't know ...
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2answers
63 views

Block a computer from all but 1 or 2 websites?

I'm setting up a computer for our machine shop that is intended for them to only get to a couple sites they may need while working. It needs to still be on our network so they can look at files saved ...
2
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2answers
5k views

“Require not ip” .htaccess doesn't work in a single ip

I am having trouble with blocking an IP in .htaccess I've put Require not ip 192.168.20.218 It works, but it blocks the entire network instead of blocking a single IP. Can somebody solve this ...
5
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3answers
2k views

How do I unmount one of two devices mounted to the same mount point?

I accidentally left two different devices mounted on /opt: /dev/xvdf on /opt type ext4 (rw,relatime,seclabel,data=ordered) /dev/md0 on /opt type ext4 (rw,relatime,seclabel,stripe=256,data=ordered) ...
1
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1answer
340 views

Deciphering kpartx output

I hope I've posted this in the proper place, if I haven't then please advise me on where to move the post. I've tried deciphering the kpartx output myself but now I'm sort of stuck and in need of ...
1
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1answer
69 views

Block Clients based on RTT

I am running an application on my Debian server, which uses IPv4 and UDP for data communication. I would like to block every client for a short while, that has a Round Trip Time above 140ms. ...
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0answers
183 views

Dealing with big blocklists: Is it better to DNS Blackhole or block at firewall level

Setting up some new protections for networks and I've found myself with two different options. Due to the size of the lists (easily 2,500,000+ domains) is it better to setup DNS servers to blackhole ...
1
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5answers
507 views

How do you mitigate LAN clients from participating in DDOS?

Most references I've read about mitigating DDOS involve edge routers. However, is there anything you can do to mitigate your LAN clients from unknowlingly participating in a DDOS ? Like blocking ...
0
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1answer
3k views

How can I block all HEAD requests to urls that contain a substring on Apache?

A server I administer is being pounded with a poorly coded AWS-built bot that switches IPs constantly and appears to be stuck in a recursive encoding loop. The only consistent fingerprint I can see is ...
1
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1answer
2k views

How to block a small IP range in csf

I'm looking for a way to block a small ip range in csf, e.g. 151.80.31.103 to 151.80.31.115 I know how to block each ip by issuing a cmmand csf -d IP, but it is a lot more effective to have a way to ...
0
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2answers
460 views

How to block access to web-hosting servers?

Is there a way to block all web-hosting servers trying to access my server? There are a lot of hacked websites used to do damage to my server and only common thing is IP of agressor (many of IP's) is ...
-1
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1answer
446 views

How to prevent an openly recursive DNS server from being abused for DNS amplification [closed]

I have a business need to provide an open and recursive DNS. This DNS has of course been heavily abused by DNS amplification attacks, resulting in 5-10 Mbps sustained outbound load only caused by ...
-1
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2answers
995 views

Does the bash usleep block? Or will it yield to other threads? [closed]

I understand there is a usleep command in bash. Is this a "busy" or "blocking" sleep? Or will this yield time to other processes?
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0answers
386 views

domain redirect to STRATO.NL managed server (block?)

I have a managed server from strato.nl I have a domain on OVH and I want for my OVH domain to redirect to the managed server. I have configured the DNS so that xxx.ovh domains points to the IP of the ...
0
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1answer
259 views

Postfix Virtual Domain - mail is send by second server [duplicate]

i setup postfix on a VPS with two domains (each one with own ip) domain1 - 194.xxx.xxx.1 domain2 - 194.xxx.xxx.2 when i send a mail via domain2 - i am getting dmarc reports that the mail uses the ...
1
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2answers
2k views

Block direct IP connections to Apache web server [duplicate]

I need to figure out how to block direct IP access to my website. Example: I want it so that when people type my IP address 1.2.3.4 into the browser it doesn't work, but when they type www.example....
1
vote
2answers
2k views

Block request to certain url call from server

i have website running , that call url of some other website is there any way to block call to particular website. For eg : inside some part of my website a call is made to url like abc.com/xxx/aa ...
1
vote
2answers
1k views

Linux swapping blocks system (freeze)

I have a problem with my Debian Servers. We run 4 different server which all have Intel CPUs and 128GB of RAM. Two of them run Wheezy, two of them run Jessie. We run a Java software on those systems ...
0
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1answer
43 views

Avaya switch - need to block port 25

Situation: In QA-DEV Lab environment I need to block port 25 for the egress traffic on AVAYA ERS5510-48T switch. Question: How do I do it using EDM aka Web Interface? Couldn't find anything in ...
0
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0answers
475 views

How to block device trying to connect to your wifi

In my log-file I see that hostapd shows that a device is continuously trying to connect and disconnect which slows down the network & pollutes the log-file and. Anyone knows how to block a device ...
1
vote
2answers
7k views

block DNS Amplification Attack by iptables

Last time I've got warings about DNS Amplification Attack from NFOservers.com DDoS notifier 2015-12-30 23:28:52.609178 IP (tos 0x0, ttl 54, id 42635, offset 0, flags [+], proto UDP (17), length 1500)...
2
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1answer
437 views

How can I mitigate spoofed emails entering my network?

My company is receiving a lot of spoofed emails. For example. user@mycompany.com receives emails from user@mycompany.com containing malware or a bad links. My domain mycompany.com has a SPF record ...
0
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0answers
162 views

server 2012 not receiving data on specific port

I installed a windows server 2012 r2 standard + sql 2008 r2 standard on a new dell server for a client of mine as regular workgroup file server (not acting as a Domain Controller) 3 months ago and all ...
0
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0answers
261 views

Xen bridge - block traffic from port range - iptables / ebtables

I use Xen with bridge interface : - eth0 - viifbr0 - Name of VM interface : vifv10XX.0 Do you know if it is possible to block output traffic from source port range for a domU please ? If yes, can ...
1
vote
1answer
442 views

iptables accept specific packet id

I want to allow only packets with a specific id (identification field), for example packets with id=3 are accepted and others dropped. And I want to do the same thing with the offset, so for example ...
2
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3answers
199 views

Block people searching for server admin pages

Occasionally I flip through our (apache) access log and I often come across people trying to fish for admin pages. For example, they are trying to access pages like: /wp-login.php /administrator/...
0
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1answer
2k views

Iptables drop outgoing HTTPs GET request matches string in payload [closed]

I'm using CentOS 5.8(final), kernel 2.6.18-308.8.2, iptables v1.3.5 I want to block a HTTPs POST/GET request to outside which matches a string (defined as ABCxyz) in the POST/GET payload. I tried to ...