I tested again, it appears that some network port /or possible firewall is blocking photon on some of the machines ( NameServer peer error 3001 followed by peer timeout 3004).
Then this is not iOS-specific problem as you described it earlier.
[quote:9bo5cjt0]What ports does photon need open?
You found right doc for required ports http://doc.exitgames.com/en/onpremise/c ... rt-numbers
It states that when connecting to cloud via websockets, ports 9090, 9091, 9093 required.
If you use secure websockets then 19090, 19091, 19093 should be open.
EDIT: ports list updated (removed port which required only for self-hosted server)