I get the error:
"4126.96.36.199 Primary target IP address responded with 4188.8.131.52 Connection dropped due to SocketError"
I am able to send from 2003 to 2010, and from 2010 to internet email addresses and back again however the only route that doesnt work is from 2010 to 2003.
I have created a bidirectional RGC but still the same error appears. Googling this issue only leads to dead ends.
I would massively appreciate it if anyone could help!