Polling tentacle - underlying connection was closed

I’m trying to create a new polling tentacle. When I click on install in the tentacle setup wizard I get the errors:

Checking that server communications are open failed with message The underlying connection was closed: An unexpected error occurred on a send.. Retrying (4/5) in 00:00:02.5312500.
System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send. ---> System.IO.IOException: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

What could be the reason for this error?
(How do I attach the log files?)

Hi @cecilia,

Thanks for reaching out to Octopus Support, and I’m sorry to see you are having issues getting a new tentacle registered.

At first glance, this looks like an error we typically see when something on the network blocks access to your cloud instance.

During the initial tentacle registration, we need outbound traffic open over ports 443 and 10943. If you can, it would be good to check with your network team to verify those exceptions have been made in any firewall between your deployment target and your Cloud instance.

Our Tentacle troubleshooting doc has some good information on different things you can look for. The most basic test is ensuring you can browse to https://yoururl.octopus.app and https://yoururl.octopus.app:10943 from the machine.

Please send us your tentacle log from that machine so we can look to see if anything stands out. I will send you a secure upload link you can use to send those over to us. Please let me know if this helps or if you have other questions.


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