as seen in the subject, I have a problem regarding the renegotiation of a TLS connection. The problem occurs after around 15 - 30 Minutes. The connection times out respectively the client is unable to build a data connection. The tls.log prints out the following error: "starting TLS negotiation on data connection / TLS negotiation timed out (300 seconds)" But the two error messages get logged multiple times in the same second.
I already googled a lot and tried different things like setting the PassivePorts in the client and server firewall. Turned on and off "AllowClientRenegotiations". Tried different TLSRenegotiate Options like :" none / ctrl 7200 timeout 300 / required off".
I also attached a part of the log file, so you can see the timing from the error messages. I really hope you can help me, this problem is really frustrating.
Thanks in regards
My proftpd.conf(without comments):
DisplayChdir .message true
My tls.conf (without comments)
TLSProtocol SSLv3 TLSv1
PassivePorts 20000 20100
TLSOptions NoSessionReuseRequired AllowClientRenegotiations
TLSRenegotiate ctrl 7200 timeout 300
TLSRenegotiate required off
TLSSessionCache internal: 3600