Maintained by: NLnet Labs

error: outgoing tcp: bind: Address already in use

W.C.A. Wijngaards
Thu Jul 6 10:30:19 CEST 2017

Hi Nick,

The config number for outgoing tcp is likely too low.  outgoing-num-tcp:

Also, you may be running out of port numbers, perhaps this causes the
'bind a tcp socket returns errno Address already in use', because the
choice of port number was left to the kernel?  Unless you force a
particular port number in the config, but that is unlikely.  People
usually want to change the kernel handling of timewait with port reuse
when that happens.

Best regards, Wouter

On 06/07/17 10:13, Nick Urbanik via Unbound-users wrote:
> Dear Folks,
> A DNS server running unbound 1.6.3 has these messages; any suggestions
> on what is happening?
> error: serviced_tcp_initiate: failed to send tcp query
> error: outgoing tcp: bind: Address already in use

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