[Serusers] SIP 304 Temporary moved: sendto returning errno 1

[Vincent Pelletier]

Hi.

I built & installed ser-2.0.0-rc1 on a debian stable amd64.
When I try to redirect a call (case where destination user redirects before 
answering), it gets an SIP error 477.
Corresponding error from SER process running in foreground:

 0(30330) ERROR: udp_send: 
sendto(sock,0x2aebd16fc038,1227,0,xx.xx.xx.xx:xxxx,16): Operation not 
permitted(1)
 0(30330) msg_send: ERROR: udp_send failed
 0(30330) ERROR: t_send_branch: sending request on branch 0 failed
 0(30330) ERROR: sl_reply_error used: Unfortunately error on sending to next 
hop occurred (477/SL)

Unfortunately, "1" (EPERM) is not documented in sento manpage, as far as I can 
see, so it's quite hard to track down that problem.

Kernel version is: 2.6.24.5-grsec
iptables is used, but putting netcat in place of SER and the client shows that 
kernel allows packets to reach client (and more simply, it is possible to do 
a direct call, it's just redirects which fail).

It can be a grsec problem, I still have to check that part, but I wanted to 
take the chance of helpful feedback in the meantime.

Regards,
-- 
Vincent Pelletier