Hi
Since I changed the router in my setup from an OpenWrt router to an Apple Airport Time Capsule, I can no longer get any incoming connections.
I have tried with automatic and manual port forwarding and neither works. I'm fairly sure this is a compatibility issue between Apple Airport and Transmission, as automatic forwarding used to work nicely with OpenWrt/miniupnpd. Firmware on the Airport is 7.7.9, but the problem was also present with 7.7.8. Transmission is running on a 2017 Macbook Pro with OS X 10.13.2.
Here's my log when disabling and re-enabling automatic port forwarding:
2017-12-29 19:18:23 +0000 port-forwarding.c:180 [Info] Port Forwarding: Stopped
2017-12-29 19:18:23 +0000 natpmp.c:70 [Info] Port Forwarding (NAT-PMP): sendnewportmappingrequest succeeded (12)
2017-12-29 19:18:23 +0000 port-forwarding.c:92 [Info] Port Forwarding: State changed from "Forwarded" to "Stopping"
2017-12-29 19:18:38 +0000 natpmp.c:70 [Info] Port Forwarding (NAT-PMP): initnatpmp succeeded (0)
2017-12-29 19:18:38 +0000 natpmp.c:70 [Info] Port Forwarding (NAT-PMP): sendpublicaddressrequest succeeded (2)
2017-12-29 19:18:38 +0000 upnp.c:239 [Debug] Port Forwarding (UPnP): UPNP_GetValidIGD failed (errno 0 - Undefined error: 0)
2017-12-29 19:18:38 +0000 upnp.c:242 [Debug] Port Forwarding (UPnP): If your router supports UPnP, please make sure UPnP is enabled!
2017-12-29 19:18:38 +0000 port-forwarding.c:92 [Info] Port Forwarding: State changed from "Not forwarded" to "Starting"
2017-12-29 19:18:46 +0000 natpmp.c:70 [Info] Port Forwarding (NAT-PMP): readnatpmpresponseorretry succeeded (0)
2017-12-29 19:18:46 +0000 natpmp.c:138 [Info] Port Forwarding (NAT-PMP): Found public address "XX.XX.XX.XX"
2017-12-29 19:18:46 +0000 natpmp.c:70 [Info] Port Forwarding (NAT-PMP): sendnewportmappingrequest succeeded (12)
2017-12-29 19:18:46 +0000 natpmp.c:70 [Info] Port Forwarding (NAT-PMP): readnatpmpresponseorretry succeeded (0)
2017-12-29 19:18:46 +0000 natpmp.c:218 [Info] Port Forwarding (NAT-PMP): Port 57777 forwarded successfully
2017-12-29 19:18:46 +0000 port-forwarding.c:92 [Info] Port Forwarding: State changed from "Starting" to "Forwarded"
Any clues?