Unable to reuse a port for UDP on Windows

I have a UDP server running on a specific port. When I create the socket on this port, I first created it unbound, set the reuseaddr option to true and then bound it to this port. When I receive a new connection to this port, I spawn a new thread and this new thread creates a new socket on the same port using the same method describes earlier. The new thread then does a connect to this new client.
The problem is that after the connect, the main thread is not able to receive anything on the port. The new thread is fine and handles all the traffic coming from it's connected client. The main thread is pretty useless. Only after the new thread is done and it closes the socket, the main thread starts receiving stuff again.
The most interesting thing out of all this is that this behaviour is seen only only Windows. My code works fine on Linux. The main thread accepts new connections and spawns new threads which do connects and so on.
I am stumped. How do I make windows do multithreading on a UDP socket reusing the same port?

Cross/multi-posted, so don't answer here, ok?
http://forum.java.sun.com/thread.jsp?thread=452580&forum=31&message=2059046

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Starting Nmap 4.20 ( http://insecure.org ) at 2007-06-25 20:49 IST
Interesting ports on 192.168.1.1:
Not shown: 1679 filtered ports
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80/tcp open http
443/tcp closed https
554/tcp closed rtsp
1755/tcp closed wms
2401/tcp closed cvspserver
5000/tcp closed UPnP
5001/tcp closed commplex-link
5050/tcp closed mmcc
6881/tcp closed bittorent-tracker
6969/tcp closed acmsoda
7070/tcp closed realserver
8000/tcp closed http-alt
8080/tcp closed http-proxy
8888/tcp closed sun-answerbook
11371/tcp closed pksd
Nmap finished: 1 IP address (1 host up) scanned in 27.653 seconds
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Starting Nmap 4.20 ( http://insecure.org ) at 2007-06-25 20:48 IST
Interesting ports on 192.168.1.5:
Not shown: 1696 closed ports
PORT STATE SERVICE
6000/tcp open X11
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Starting Nmap 4.20 ( http://insecure.org ) at 2007-06-25 20:50 IST
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5050/tcp closed mmcc
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Everywhere the bittorrent port seems to be closed. [b]How do I open this port?.[b/]
Last edited by ravisghosh (2007-06-25 21:09:55)

@madeye, first of all I used utorrent in Then I tried as you [shantanu@bluehead Chain INPUT (policy DROP)
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target prot opt source ACCEPT 0 -- anywhere ACCEPT icmp -- anywhere ACCEPT icmp -- anywhere ACCEPT icmp -- anywhere srcfilt 0 -- anywhere Chain OUTPUT (policy DROP)
target prot opt source ACCEPT 0 -- anywhere ACCEPT udp -- anywhere ACCEPT 0 -- anywhere ACCEPT icmp -- anywhere ACCEPT icmp -- anywhere ACCEPT icmp -- anywhere s1 0 -- anywhere Chain f0to1 (3 references)
target prot opt source ACCEPT udp -- anywhere ACCEPT icmp -- anywhere ACCEPT tcp -- anywhere logdrop 0 -- anywhere Chain f1to0 (1 references)
target prot opt source ACCEPT tcp -- anywhere ACCEPT tcp -- anywhere ACCEPT tcp -- anywhere ACCEPT tcp -- anywhere ACCEPT tcp -- anywhere ACCEPT tcp -- anywhere ACCEPT tcp -- anywhere ACCEPT tcp -- anywhere ACCEPT tcp -- anywhere ACCEPT tcp -- anywhere ACCEPT tcp -- anywhere ACCEPT tcp -- anywhere ACCEPT udp -- anywhere ACCEPT tcp -- anywhere ACCEPT tcp -- anywhere ACCEPT tcp -- anywhere ACCEPT tcp -- anywhere ACCEPT udp -- anywhere ACCEPT tcp -- anywhere ACCEPT udp -- anywhere ACCEPT icmp -- anywhere ACCEPT tcp -- anywhere ACCEPT tcp -- anywhere ACCEPT tcp -- anywhere logdrop 0 -- anywhere Chain logaborted (1 references)
target prot opt source logaborted2 0 -- anywhere LOG 0 -- anywhere Chain logaborted2 (1 references)
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target prot opt source LOG 0 -- anywhere DROP 0 -- anywhere Chain logreject (0 references)
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target prot opt source LOG 0 -- anywhere REJECT tcp -- anywhere REJECT udp -- anywhere DROP 0 -- anywhere Chain nicfilt (1 references)
target prot opt source RETURN 0 -- anywhere RETURN 0 -- anywhere RETURN 0 -- anywhere logdrop 0 -- anywhere Chain s0 (1 references)
target prot opt source f0to1 0 -- anywhere f0to1 0 -- anywhere f0to1 0 -- anywhere logdrop 0 -- anywhere Chain s1 (1 references)
target prot opt source f1to0 0 -- anywhere Chain srcfilt (2 references)
target prot opt source s0 0 -- anywhere That means iptables I removed guarding Removed iptables and Last edited by thanks a lot for such elaborate help.
windows and u r very much right that it uses UPnP. In deluge (bt client on arch), UPnP was there but disabled (shaded). Hence, I tried running utorrent using wine and it gave a error message "Unable to map UPnP port' and is not able to connect. So, UPnP is not working in my box.
suggested "iptables -L" and it gave me the following results.
~]$ sudo iptables -L
destination
anywhere
anywhere udp spt:bootps dpt:bootpc
192.168.1.255
anywhere state RELATED,ESTABLISHED tcp flags:RST/RST
anywhere state RELATED,ESTABLISHED
anywhere icmp destination-unreachable
anywhere icmp time-exceeded
anywhere icmp parameter-problem
anywhere
anywhere
destination
anywhere state RELATED,ESTABLISHED
anywhere icmp destination-unreachable
anywhere icmp time-exceeded
anywhere icmp parameter-problem
anywhere
destination
anywhere
anywhere udp spt:bootpc dpt:bootps
anywhere state RELATED,ESTABLISHED
anywhere icmp destination-unreachable
anywhere icmp time-exceeded
anywhere icmp parameter-problem
anywhere
destination
anywhere udp dpts:6970:7170
anywhere icmp echo-reply
anywhere tcp spts:1024:65535 dpts:6881:6889 state NEW
anywhere
destination
anywhere tcp spts:1024:5999 dpt:6969 state NEW
anywhere tcp spts:1024:5999 dpt:http state NEW
anywhere tcp spts:1024:5999 dpt:http-alt state NEW
anywhere tcp spts:1024:5999 dpt:8008 state NEW
anywhere tcp spts:1024:5999 dpt:8000 state NEW
anywhere tcp spts:1024:5999 dpt:8888 state NEW
anywhere tcp spts:1024:5999 dpt:ftp state NEW
anywhere tcp spts:1024:5999 dpt:https state NEW
anywhere tcp dpt:rtsp state NEW
anywhere tcp dpt:7070 state NEW
anywhere tcp spts:1024:5999 dpt:cvspserver state NEW
anywhere tcp dpt:1755 state NEW
anywhere udp dpt:1755
anywhere tcp spts:1024:5999 dpt:11371 state NEW
anywhere tcp spts:1024:5999 dpt:5050 state NEW
anywhere tcp spts:1024:5999 dpt:telnet state NEW
anywhere tcp spts:1024:5999 dpts:5000:5001 state NEW
anywhere udp spts:1024:5999 dpt:5000
anywhere tcp dpt:domain state NEW
anywhere udp dpt:domain
anywhere icmp echo-request
anywhere tcp spts:1024:5999 dpt:5222 state NEW
anywhere tcp spts:1024:5999 dpt:5223 state NEW
anywhere tcp spts:1024:5999 dpts:6881:6889 state NEW
anywhere
destination
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anywhere limit: avg 2/min burst 1 LOG level warning prefix `LIMITED '
destination
anywhere LOG level warning tcp-sequence tcp-options ip-options prefix `ABORTED '
anywhere state RELATED,ESTABLISHED
destination
anywhere limit: avg 1/sec burst 10
anywhere limit: avg 2/min burst 1 LOG level warning prefix `LIMITED '
anywhere
destination
anywhere LOG level warning tcp-sequence tcp-options ip-options prefix `DROPPED '
anywhere
destination
anywhere limit: avg 1/sec burst 10
anywhere limit: avg 2/min burst 1 LOG level warning prefix `LIMITED '
anywhere reject-with tcp-reset
anywhere reject-with icmp-port-unreachable
anywhere
destination
anywhere LOG level warning tcp-sequence tcp-options ip-options prefix `REJECTED '
anywhere reject-with tcp-reset
anywhere reject-with icmp-port-unreachable
anywhere
destination
anywhere
anywhere
anywhere
anywhere
destination
192.168.1.5
192.168.1.255
bluehead.localdomain
anywhere
destination
anywhere
destination
anywhere
is not disabled and that firewall rules are setup by guarddog.
using "pacman -Rns guarddog" and rebooted. Still get the same results with utorrent and "iptables -L" and also the port test shows tcp 6881 is still closed.
now bt clients seems to be able to connect and it works; however, port test still shows tcp 6881 closed.
ravisghosh (2007-06-27 16:51:12)

Portmap translation creation failed for udp src inside dst inside

Hi!
I have a problem with allowing traffic to UC500 subnets on ASA 5505 inside interface.
My asa is a main router with addres 192.168.1.1
UC500 voip box is connected to ASA's inside interface through UC500 WAN port with UC500 with 192.168.1.2 address.
Firewall and NAT on UC500 is disable
UC500 sip traffic works fine. voipbox creates its subnets for data and voip - 192.168.10.0 and 10.1.1.0. another important address is 10.1.10.1 which is UC500 CUE.
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3
Sep 07 2013
00:21:49
DC
53
PBXCUE
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I tried exempting uc500 subnets on ASA but that didn;t work.
Funny thing is that I CAN reach the UC500 subnets when connecting with VPN to ASA...
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dynamic-access-policy-record DfltAccessPolicy

Hello Julio!
Thank you for your advice.
I have managed to solve my main problem by reconfiguring my switches vlans - enabling trunk port configs for required ports and allowing them access to both vlans.
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I am only an enthusiast but my recent successes have given me apetite for more...
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access-list inside_nat0_outbound extended permit ip any PBXVOIP-network 255.255.255.0
access-list inside_nat0_outbound extended permit ip any PBXCUE-network 255.255.255.0
access-list inside_nat0_outbound extended permit ip 192.168.1.0 255.255.255.0 igolomska-network 255.255.255.0
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access-list inside_access_in extended permit ip any any
access-list inside_access_in extended permit ip host RBSTORE_NAS any
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access-list inside_access_in extended permit tcp any any eq 5432
access-list inside_access_in extended permit tcp any host PBXCUE eq www
access-list inside_access_in extended permit tcp host PBXCUE any eq www
access-list inside_access_in extended permit tcp host RBCAMSTORE_NAS host EXCH-MBX eq smtp
access-list inside_access_in extended permit tcp host RBSTORE_NAS host EXCH-MBX eq smtp
access-list inside_access_in extended permit tcp host RENBETUPS host EXCH-MBX eq smtp
access-list inside_access_in extended permit tcp host RenBetPBX host EXCH-MBX eq smtp
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access-list outside_1_cryptomap extended permit ip 192.168.1.0 255.255.255.0 igolomska-network 255.255.255.0
route print shows:
and 192.168.1.240 is my VPN IP - its metric has higher priority than the local gateway.
How do I change it?
Active Routes:
Network Destination        Netmask          Gateway       Interface Metric
          0.0.0.0          0.0.0.0      192.168.2.1    192.168.2.126   4250
          0.0.0.0          0.0.0.0         On-link     192.168.1.240     21
      80.51.24.22 255.255.255.255      192.168.2.1    192.168.2.126   4251
        127.0.0.0        255.0.0.0         On-link         127.0.0.1   4531
        127.0.0.1 255.255.255.255         On-link         127.0.0.1   4531
127.255.255.255 255.255.255.255         On-link         127.0.0.1   4531
      169.254.0.0      255.255.0.0         On-link     192.168.2.126   4506
169.254.104.126 255.255.255.255         On-link     192.168.2.126   4506
169.254.255.255 255.255.255.255         On-link     192.168.2.126   4506
    192.168.1.240 255.255.255.255         On-link     192.168.1.240    276
      192.168.2.0    255.255.255.0         On-link     192.168.2.126   4506
    192.168.2.126 255.255.255.255         On-link     192.168.2.126   4506
    192.168.2.255 255.255.255.255         On-link     192.168.2.126   4506
        224.0.0.0        240.0.0.0         On-link         127.0.0.1   4531
        224.0.0.0        240.0.0.0         On-link     192.168.2.126   4506
        224.0.0.0        240.0.0.0         On-link     192.168.1.240     21
255.255.255.255 255.255.255.255         On-link         127.0.0.1   4531
255.255.255.255 255.255.255.255         On-link     192.168.2.126   4506
255.255.255.255 255.255.255.255         On-link     192.168.1.240    276
===========================================================================
I am starting to feel like I am using a bit too much of your friendliness ...
Best Regards and have a great day!
Lukasz

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http://www.newegg.com/Product/Product.aspx?Item=N82E16822236339

Can't set port for IRC in Sharing/Firewall preferences...

I turned on the firewall and was able to specify ports for Bittorrent, but I want to use IRC (it keeps getting blocked, which I'm assuming has something to do with the firewall which I just activated), so I went into System Preferences-->Sharing-->Firewall, scrolled down to IRC and then Edit, for TCP number it has 194 (but grayed out) and UDP it's blank, but I can't alter either entry box.
It's my computer and I have whatever access privileges I need (I think) so at a loss here. Can anyone point me in the right direction?
P.S. Some of the IRC servers I wanted to set up accounts with had port listings of 6667 and the like, that's also why I wanted to specify the number.

Create a new entry with a name such as IRC #2 and add the desired ports to that entry. You cannot alter the ports assigned to the default entries; you need to create new ones to specify additional ports.
(15661)

Open port 916/udp not closeable

A nmap scan from the Internet (WAN) against a Cisco RV120W shows an open port 916/udp. This port remains open even if one writes an explicit access rule for the firewall.
A quick googling shows that this port is probably used to access the firmware of the router from the outside as well as it has been involved in security problems some years ago. See http://osvdb.org/show/osvdb/34520
How can this port be closed?
Michael

Dear Michael,
Thank you for reaching the Small Business Support Community.
I would first suggest you to upgrade to the latest firmware release version 1.0.4.10;
http://software.cisco.com/download/release.html?mdfid=282981372&softwareid=282487380&release=1.0.4.10
If nmap still shows the port opened, I then suggest you to disable the remote management to determine if this is the root of the problem, then contact the Small Business Support Center to have a TAC engineer figure this out;
https://www.cisco.com/en/US/support/tsd_cisco_small_business_support_center_contacts.html
Please do not hesitate to reach me back if there is anything I may assist you with.
Kind regards,
Jeffrey Rodriguez S. .:|:.:|:.
Cisco Customer Support Engineer
*Please rate the Post so other will know when an answer has been found.

Do I need to open ports for NTP?

I just noticed that my hwclock was off by nearly 30 seconds. It's almost certainly due to the recent initscripts update.
As I was looking into resetting the clock, I found out that openntpd is deprecated so I've switched to ntp, configured the daemon, reset the time with ntpd -q, and started the daemon. The time is not accurate again.
I remember back when I first installed Arch I tried to set up ntp but it didn't seem to work, so I tried openntpd and stuck with that. I reached the conclusion that ntp required open ports, which I felt was unnecessary given that openntpd could do the same thing without open ports.
Now that I'm looking at it again, I can't find any definitive answer...
Do I need to open ports for ntp if I only want to sync the system that it's running on?

ISC ntpd (the ntp package) will open UDP 123 on all your interfaces regardless of what you do with it. It will work anyway even if you block this port in iptables, assuming that you're allowing responses to established traffic as usual - your outbound mobilization requests to your chosen servers will be enough to allow the responses, and the same with further traffic sent for the lifetime of ntpd. Using iptables like this is probably the easiest way to secure ntpd.
There's also some defense in depth you can do:
- run ntpd as non-root
- run it chrooted to some safe directory (really only makes sense when doing non-root as well, since root can break out of a chroot)
- apply ntpd's built-in access controls (see examples in ntpd.conf, and full docs in ntp_acc(5))
I accomplish the first two of these by chowning /var/lib/ntp (and any contents) to ntp:ntp (so ntpd can write ntp.drift there when non-root), by using a driftfile path relative to the chroot in ntp.conf, and by setting NTPD_ARGS="-g -i /var/lib/ntp -u ntp:ntp" in /etc/conf.d/ntp-client.conf.
For the third, I chose to not allow any remote traffic to initiate anything with my ntpd, with this /etc/ntp.conf:
server ac-ntp0.net.cmu.edu iburst
server ac-ntp1.net.cmu.edu iburst
server ac-ntp2.net.cmu.edu iburst
server ac-ntp3.net.cmu.edu iburst
server ac-ntp4.net.cmu.edu iburst
restrict default nomodify nopeer noquery
restrict 127.0.0.1
driftfile /ntp.drift
Note the two "restrict" lines. The first shuts out remote access of most kinds, and the second allows the local machine all the access that would also be denied to it as well otherwise by the first rule. Note also the driftfile path, relative to the chroot of /var/lib/ntp/.
With all these security features, ISC ntpd can be just as safe as openntpd.
The use of the "iburst" keyword on the server lines to recover more quickly from out-of-contact conditions is also quite nice, and not rude to the remotes like "burst" would be.
One of the nicest other features of ISC ntpd is that it's smart enough to notice when network state changes occur, like bringing a VPN up/down, changing routes, or switching from wired to wireless and back. openntpd tended to just lose connections in these cases.

Windows Server 2008 opening ports for sql

Hello we upgraded our server from 2003 to 2008 and we are trying to open up the ports for the sql server and reporting services so the users can access both database and report manager from their desk. we only have one location so its not like we
need people from different locations accessing it. but for some reason the users still cant access the database even after opening ports 1433 and 80. Can anyone help please

Hi
Can you explain why does he need turn off the firewall on prod. server? Running SQL
Browser service make sense if we use named instance, the OP did not mention that. Moreover if we enable SQL Browser
service we probably need to add UDP port 1434 to the firewall.
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
MS SQL optimization: MS SQL Development and Optimization
MS SQL Consulting:
Large scale of database and data cleansing
Remote DBA Services:
Improves MS SQL Database Performance
SQL Server Integration Services:
Business Intelligence

Port for uTorrent - WRT54GC

Hi,
I need one more help.
I want to release ports for uTorrent.
I have a WRT54GC router.
I successfully logged in, and clicked on Applications and gaming, and I think there I should typed ports in the tab Port range forwarding.
Since I'm not good at that stuff, and it's my first time doing it. I want to know what numbers are for Start and End port for uTorrent, or where can I find it. I have uTorrent 2.0.3 and I only found the current port (for incoming connections) in Setup guide. In Preferences and elsewhere I didn't find anything with 'port' in it.
As for the Protocol I would go both (TCP and UDP), IP address is the same, and will check Enabled. I only don't know the Start and End port.
Thanks in further and I appreciate the help!
Thanks,
Aleks
Solved!
Go to Solution.

Or should go on the tab Port range triggering. If so, what are the numbers of Triggered range and Forwarded range?

Unable to reuse a port for UDP on Windows

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