How do I make my client acquire more than 8 connections? What settings in firewall and operating system, or flags at execution do I need to use to allow it?

  • 1
    Could you possibly expand on this question to make it less specific? This has nothing to do with ubuntu or scripts.
    – Evil Spork
    Sep 3, 2011 at 19:54
  • @Evil I understand your concern. I haven't devised a clever way to do that though.
    – Jader Dias
    Sep 4, 2011 at 1:51
  • I edited it, though since I do not yet have editing permissions, others need to approve it.
    – Evil Spork
    Sep 4, 2011 at 2:04
  • @Evil I approved it
    – Jader Dias
    Sep 4, 2011 at 2:12
  • See also bitcoin.stackexchange.com/q/2378/659 for a similar question. Feb 20, 2012 at 8:35

2 Answers 2


Typically connection counts of 10 or lower usually indicate that you are behind a router or firewall that is not configured properly. Try enabling UPnP from within the Bitcoin client's options dialog. If that doesn't work, try manually forwarding port 8333 to the computer which is running the Bitcoin client/daemon.

  • You're right. The UPnP was activated by default but not working. The router was forwarding to an old IP address, and I fixed it by reseting it, so nothing changed on the PC.
    – Jader Dias
    Sep 2, 2011 at 22:14
  • 2
    The outbound connection limit is exactly 8, the inbound connections are only limited by the -maxconnections total which is usually 125 (version 0.3.25). Sep 2, 2011 at 22:21
  • 1
    Thanks! It helped me realize my router had UPnP off. *facepalm
    – user173
    Sep 3, 2011 at 7:15
  • 2
    @EvilSpork is right. For easiest solution use UPnp. For the manual but much safer solution use port forwarding. Also having open inbound connection port (eithe manual or uPnp) also makes the rest of the network stronger. Firewalled clients can only receive connections from non-firealled clients so your open inbond port improves the connection access of nearby firewalled clients. Oct 17, 2011 at 13:03
  • 1
    One thing I would add is that only one client on a network subnet (your home LAN) needs inbound connection. The clients are "smart" enough to look for peers on local network first so if one client on your home LAN gets a new transaction it will be relayed to all other clients on the LAN. Oct 17, 2011 at 13:05


To disable the half-open TCP connections limit, set the value of the
EnableConnectionRateLimiting DWORD registry entry to 0 (0x00000000). To do this, follow these steps:

 1.       Click Start, type regedit in the Start Search box, and then click       
 regedit.exe in the Programs list. If you are prompted for an administrator   
 password or for confirmation, type your password, or click Continue.
  1. Locate and then double-click the following registry key:
  1. In the Value data box, type 0, and then click OK.

  2. Exit Registry Editor.

 5.       Restart the computer.

B) Open the command prompt and use the following opening switches, alternatively you could plug the switches into the properties of your exec. shortcut.

bitcoin-qt -maxconnections=1000 -maxreceivebuffer=5000 -maxsendbuffer=128 -upnp=1 -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode= -seednode=[2001:470:b3d5:1:641c:6bff:fe9d:bccf]:8333 -seednode=[2601:601:1380:395:c1a:622c:4dd5:363d]:8333 -seednode=[2601:240:d002:2979:69fc:f725:bdc:d8ec]:8333 -seednode=[2601:601:cf80:3e44:f34:2645:867d:f7f6]:8333 -seednode=[2601:441:4480:1618:1077:aa2c:2d9:b5e]:8333 -seednode=[2601:441:4480:1618:1077:aa2c:2d9:b5e]:8333 -seednode=2601:c0:c100:1880:21f:5bff:fe3c:6e84]:8333 -seednode=[2603:3024:181e:3200:ec4:7aff:fe6b:8826]:8333 -seednode=[2601:445:4380:3692:260a:64ff:fe92:15ed]:8333 -seednode=[2001:558:6024:8:45ab:91b9:1f6c:f673]:8333 -seednode=2601:241:301:3ca5:45ff:3590:18bb:abc3]:8333 -seednode=[2601:380:4102:abe0:c9b2:6874:d4aa:2dfc]:8333 -seednode=[2601:446:c200:3580:7161:8278:33fe:effa]:8333 -seednode=[2601:644:8600:4875:470:de72:7c3e:f326]:8333 -seednode=2601:6c3:8380:143c:134:2d28:b933:755d]:8333 -seednode=[2601:1c2:600:bb:ab55:7b10:9f49:c333]:8333 -seednode=[2603:3024:1890:0:88f7:b3ff:feda:18d5]:8333 -seednode=[2002:496d:6fc3:e472:604b:e70c:fe47:d969]:8333 -seednode=2601:408:8100:1480:8ccc:6d53:5a67:2f82]:8333 -seednode=[2601:408:8100:1480:8ccc:6d53:5a67:2f82]:8333 -seednode=[2601:40a:202:6ff0:7cb9:6352:19df:f2b6]:8333 -seednode=[2603:3022:501:7800:495c:728c:ed5d:5d75]:8333 -seednode=2601:152:4400:1d50:30d6:854e:d379:2be]:8333 -seednode=[2601:101:c100:cd69:cd5a:41e:ff56:cf5d]:8333 -seednode=[2601:646:8e80:3ff9:d250:99ff:fe83:a470]:8333 -seednode=[2002:c1c6:6623::c1c6:6623]:8333 -seednode=[2002:58de:961e::58de:961e]:8333 -seednode=[2a04:c000:ed51:917:68::1]:8333 -seednode=[2605:a601:a48:a900:3c1a:85a:1a1:120a]:8333 -seednode=[2001:470:1f12:1dd::2]:8333 -seednode=[2001:470:1f12:1dd::2]:8333 -seednode=[2001:19f0:ac01:3f7:5400:1ff:fe43:e94b]:8333 -seednode=[2604:e880:0:15:ec4:7aff:fe4a:40e1]:8333 -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode= -addnode=[2001:470:b3d5:1:641c:6bff:fe9d:bccf]:8333 -addnode=2601:601:1380:395:c1a:622c:4dd5:363d]:8333 -addnode=[2601:240:d002:2979:69fc:f725:bdc:d8ec]:8333 -addnode=[2601:601:cf80:3e44:f34:2645:867d:f7f6]:8333 -addnode=[2601:441:4480:1618:1077:aa2c:2d9:b5e]:8333 -addnode=2601:441:4480:1618:1077:aa2c:2d9:b5e]:8333 -addnode=[2601:c0:c100:1880:21f:5bff:fe3c:6e84]:8333 -addnode=[2603:3024:181e:3200:ec4:7aff:fe6b:8826]:8333 -addnode=[2601:445:4380:3692:260a:64ff:fe92:15ed]:8333 -addnode=[2001:558:6024:8:45ab:91b9:1f6c:f673]:8333 -addnode=[2601:241:301:3ca5:45ff:3590:18bb:abc3]:8333 -addnode=[2601:380:4102:abe0:c9b2:6874:d4aa:2dfc]:8333 -addnode=[2601:446:c200:3580:7161:8278:33fe:effa]:8333 -addnode=2601:644:8600:4875:470:de72:7c3e:f326]:8333 -addnode=[2601:6c3:8380:143c:134:2d28:b933:755d]:8333 -addnode=[2601:1c2:600:bb:ab55:7b10:9f49:c333]:8333 -seednode=[2603:3024:1890:0:88f7:b3ff:feda:18d5]:8333 -addnode=2002:496d:6fc3:e472:604b:e70c:fe47:d969]:8333 -addnode=[2601:408:8100:1480:8ccc:6d53:5a67:2f82]:8333 -addnode=[2601:408:8100:1480:8ccc:6d53:5a67:2f82]:8333 -addnode=[2601:40a:202:6ff0:7cb9:6352:19df:f2b6]:8333 -addnode=2603:3022:501:7800:495c:728c:ed5d:5d75]:8333 -addnode=[2601:152:4400:1d50:30d6:854e:d379:2be]:8333 -addnode=[2601:101:c100:cd69:cd5a:41e:ff56:cf5d]:8333 -addnode=[2601:646:8e80:3ff9:d250:99ff:fe83:a470]:8333 -addnode=[2002:c1c6:6623::c1c6:6623]:8333 -addnode=[2002:58de:961e::58de:961e]:8333 -addnode=[2a04:c000:ed51:917:68::1]:8333 -addnode=[2605:a601:a48:a900:3c1a:85a:1a1:120a]:8333 -addnode=[2001:470:1f12:1dd::2]:8333 -addnode=[2001:470:1f12:1dd::2]:8333 -addnode=[2001:19f0:ac01:3f7:5400:1ff:fe43:e94b]:8333 -addnode=[2604:e880:0:15:ec4:7aff:fe4a:40e1]:8333

  • 1
    This is unrelated to OP's question. Dec 4, 2017 at 18:43

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.