The blocking tag has no wiki summary.
24
votes
16answers
22k views
Why Block Port 22 Outbound?
I'm a programmer, and I have worked for a few clients whose networks block outgoing connections on port 22. Considering that programmers often need to use port 22 for ssh, this seems like a ...
12
votes
10answers
3k views
Block Facebook for selected users
We have a few users here who are using Facebook during working hours and their productivity is through the floor, as a temporary measure I have remotely edited their hosts files to point facebook.com ...
6
votes
2answers
3k views
MySQL InnoDB database 'hangs' on selects
I'm trying to fix MySQL configuration on our server.
Our app's specifics is that a lot of data is stored in single table (currently over 300 millions of rows). This table is used often for inserts ...
4
votes
3answers
330 views
Can i safely block all ports on my sever
I have a web server running pleks and get attacked a lot every day. I configured a firewall, and there are some predefined services such as www, and ftp, etc.
I am planning to block all the ports ...
4
votes
1answer
525 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 ...
3
votes
6answers
1k views
How can I block access to my website from certain countries using the LAMP stack?
I have a website that I do not want to be viewed by entire countries. The website is running on a LAMP server. How can I achieve this?
3
votes
1answer
97 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 ...
3
votes
1answer
2k views
Linux kernel crash - any ideas?
Been getting these runaway conditions on a lightly loaded vps (debian squeeze kernel 2.6.38-bpo.2-amd64, 2GB, SSD) - top load is nothing , then jumps to 30.0 & everything grinds to a halt. I'm ...
2
votes
5answers
278 views
Block ssh tunneling navigation in my LAN
I would like to stop people bypassing Opendns and squid proxy blocks to get on facebook using ssh tunnel to their pc home.
I know I can fix this talking to boss but I'd also like to understand better ...
2
votes
3answers
343 views
block websites in our network
We would like to block users from accessing sites like facebook and all from our network. All the connections are through our router(linux machine). What would be the best way to block the sites on ...
2
votes
2answers
333 views
Blocking rm -rf for application
I have application which during run-time generates interesting intermediate outputs to ./tmp directory.
At the end of execution this directory is deleted.
How can i preserve contents of it?
I do not ...
2
votes
2answers
3k views
How to configure a network to block gmail but allow google apps mail?
Google app mail loads via http://mail.google.com/a/[domain] and gmail loads via http://mail.google.com/mail.
How can I block computers on my LAN from accessing gmail urls but at the same time permit ...
2
votes
3answers
7k views
Squid: how to block websites for a particular IP address?
How to block websites for particular IPs by squid?
Please give solution with example or configuration file.
2
votes
3answers
3k views
SQL Alter database failed - being used by checkpoint process
On my SQL server 2008, i have a SQL agent job to restore a database on nightly basis. Procedure:
find latest backup on other server
Kill all conenction to the destination database
Restore ...
2
votes
1answer
7k views
How can a block IP addresses using Windows Server 2008 firewall?
I have started to get various login attempts from different IP addresses.
How can I block these IP addresses in the Windows Server 2008 Firewall?
2
votes
1answer
263 views
Block UDP traffic by rate/string-match on Windows 2008
I am administrating a Windows 2008 server (64-bit). It is being subjected to a focused set of DOS attacks where UDP packets are sent to a specific port and contain a specific string.
What I need to ...
2
votes
3answers
350 views
Stop slowing down fast and verbose operations when using ssh over slow connections
I often copy many files between 2 servers connected via 1GBit ethernet while I am connected via VPN and SSH over DSL. The problem is, that the verbose output (1 line per copied file) which needs to be ...
2
votes
2answers
3k views
Log and Block Website using Windows 2008 SBS
A client has asked me to setup Windows 2008 SBS to block and log websites from a list they will provide. As far as I know they only have standard edition which means I cannot use ISA. I was thinking ...
2
votes
1answer
365 views
Administrator is being blocked by server - error 406?
Few days ago I put online new portal that comes with cms I made myself. Problem that occurred is following: Administrator logs to cms, publishes few news and then he can't access portal at all (whole ...
2
votes
1answer
90 views
Block specific client on CentOS by client name
I am looking at my Apache access log and there is suspicious activity from several ip ranges. What they have in common is that all of them are identified as "Allegro-Software-WebClient/4.07".
Is ...
2
votes
2answers
221 views
I have a blocking transaction, but no statement is shown
My SQL Server 2008 started hanging on simple queries, so I checked for blocking transactions, using the built-in All Blocking Transactions report. Sure enough, such a transaction exists. However, if ...
2
votes
1answer
2k views
Disk IO causing high load on Xen/CentOS guest
Background
I'm having serious issues with a xen based server, this is on the guest partition. It's a paravirtualized CentOS 5.5. I'm not sure if it's hardware or software related, or in between ...
2
votes
1answer
692 views
NFS-shared file-system is locking up
Our NFS-shared file-system is locking up.
Please feel free to ask any questions you feel relevant. :)
At the time, there are a lot of processes in "disk sleep" state, and the load averages on our ...
1
vote
2answers
264 views
How to ban potential hacker IP Addresses from Port 80?
I am hosting a bunch of PHP web sites on a web server. While I have taken all precautionary mesaures to protect all ports, Port 80 specific attacks continue. I want to ban any IP Address that taken an ...
1
vote
4answers
600 views
blocking bad websites in ISP level
how do you approach blocking bad websites such as malicious websites, porn and etc in ISP Level.
1
vote
1answer
130 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
2answers
980 views
Are there internet users connecting with HTTP/1.0?
Are there internet users connecting with HTTP/1.0? Such as over a proxy. Because I'm going to block HTTP/1.0 since most of the bots are using HTTP/1.0.
1
vote
3answers
985 views
How do I block all websites (except for a whitelist of 10 or so) for specific computers on a Windows domain?
I keep seeing references to something called Squid, but I take it that's only for Linux. Rather than needlessly pay $1,000+ bucks for a content filtering subscription on our firewall, I'm seeking an ...
1
vote
3answers
2k views
How do I Stop IE8 through WSUS
Currently I have a two domain enviroment of vista with all machines calling into WSUS. The with the recent advent of IE8 being avaliable through WSUS that's been great. However I want to stop IE8 ...
1
vote
3answers
1k 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
8k views
Forefront TMG Proxy blocking internal HTTP requests for FQDN
I have Forefront TMG installed as a proxy server. However, whenever I make HTTP requests to servers on the Internal network with a fully qualified DNS name, the proxy denies the connection.
Denied ...
1
vote
2answers
747 views
Use .htaccess to block *All* access to specific folders
I am not sure how to do this, but I want to block all access to a specific set of folders on my web server. Say secret01 and secret 02...
homeDir
|- data
|- www
| |- .htaccess (file)
| |- ...
1
vote
2answers
331 views
Automatically block IP in apache2 - it is possible?
Is there are a way to automatically block IPs with apache2. For example, if we get a lot requests (100s) for non-existing pages (or known patterns, like CHANGE_LIST.txt, etc.) to block that IP and add ...
1
vote
2answers
538 views
Blocking a specific URL by IP (a URL create by mod-rewrite)
We need to block a specific URL for anyone not on a local IP (anyone without a 192.168.. address)
We however cannot use apache's
<Directory /var/www/foo/bar>
Order allow,deny
Allow from ...
1
vote
1answer
24 views
Firewall blocking files using Reg_Ex needs to be adjusted
We have security in our firewall to prevent SQL-Injection from destroying any of our content:
Name
Type
Context
Severity
Pattern
Configure
CS:select_into
signature
http-url
critical
...
1
vote
1answer
98 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 ...
1
vote
3answers
157 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 ...
1
vote
3answers
2k views
How Do I Block an IP Address on ubuntu?
I have configured Ubuntu machine as router. Steps of NAT configuration are given below:
#iptables -F
#iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
#iptables-save ...
1
vote
1answer
440 views
Need help with IP filtering and port forwarding
I have a static IP assigned to me by my ISP. I want to access a server running tomcat in our network from outside the LAN. Can any one give a few pointers, to what I need to do, and where to start ...
1
vote
2answers
162 views
Where is traffic destined for a specific TCP port being blocked?
I have a server that is set up to listen to a specific port (1433), and normally there is no problem accessing that port from anywhere. From one of the locations I work, however, I can't connect to ...
1
vote
2answers
104 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 ...
1
vote
0answers
53 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
vote
1answer
340 views
Nginx: protect directory and files
I wrote this to prevent the directory "download" to be accessed but from the IP 1.2.3.4.
location ~ /folder/download {
allow 1.2.3.4;
deny all;
return 403;
}
However, the directory ...
1
vote
2answers
419 views
What's the best way to monitor SQL Server Concurrency issues?
What's the best way to monitor SQL Server Conccurency issues?
Specifically my goal is to reduce or prevent deadlocks and blocking and to catch potential concerns before they become a problem.
For ...
0
votes
6answers
843 views
Are there any Thin Client software's for WinXP that block P2P and torrent? Except server-side installation
I want to block p2p and torrent connection without any firewall or server-side software installation.
Most of all it is FREE.
Thanks.
0
votes
3answers
231 views
Why is Yahoo blocking our email address verifications and bouncing them back
I have a legitimate site www.angelescity.ph a Free Classifieds site, once someone posts an advert a verification email is sent.. Yahoo has been blocking them, not delivering and bouncing them back, ...
0
votes
2answers
510 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 ...
0
votes
3answers
739 views
Block IPs in apache2
Ok another noob questions here. I have serveral IP's probing my server for phpmyadmin and other administrator stuff, looks like they're looking for something to hack, but honestly I don't care who ...
0
votes
2answers
401 views
Blocking RDP connections from secondary IP addresses
I have a webserver running Windows 2008 R2 with multiple IPs assigned to it. I want to be able to RDP to the box via the main IP assigned to the box but not from any of the secondary IPs (ie... the ...
0
votes
1answer
204 views
Why is php-firewall blocking these ip ranges, isp's and host's? where can I found the blacklist?
The php firewall is blocking thees ip ranges for spam. Thats ok, but where is the source for this information?
$ip_array = array('24', '186', '189', '190', '200', '201', '202', '209', '212', '213', ...
