Stalled connections after update to 2.3.1_X
Since updating pfsense from a very old version to 2.3.1_X, we're encountering some strange behavior with large data transfers. Scp commands reproducibly go into the "stalled" mode (i.e. abort) after downloading around 1.5 GB. The same holds for rsync and normal downloads in the browser. If the bandwidth is limited e.g. with the scp -l flag to around 1MBps the transfer works well. I'm quite sure it has something to do with the pfsense update as there were no other changes in the network infrastructure.
Any ideas or suggestions?