On 7/10/2017 7:35 μμ, Nikolaos Milas wrote: > I am still trying to find a solution. The problem was finally traced down to a Cisco ASA bug (this firewall device lies between the connected networks); bug CSCuq80704 was resolved by an ASA software update. NFS packets were incorrectly being dropped by ASA and were causing nfs traffic to stall. After ASA software upgrade the problem has not occurred again. I can't tell why this was not happening for many months, but only lately. Case closed. Cheers, Nick