same behavior has been reproduced in Ubuntu 20, kernel 5.11.0-10-19-aws
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https://bugs.launchpad.net/bugs/1946032
Title:
NFS client fails to mount with timeout on kernel 5.4.0-1057-aws
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux-aws-5.4 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1946032
The crux of the issue seems to be the use of privileged ports, which are
(and should be) blocked by network ACL in our environment:
The functional server instance is using a non-privileged port 56242:
tcp 0 0 10.99.19.46:56242 10.99.16.151:2049 ESTABLISHED
The non-functional server is trying to
