After upgrading to kernel-3.10.0-957.21.3.el7 on a CentOS server, I experienced connection timeout issues on Windows servers trying to access SMB shares. On the contrary, I was able to access the share using a Linux system without any problem.
The bug was reported in CentOS Bug Tracker and it’s caused by one of the patches applied to address CVE-2019-11478.
Some applications set tiny SO_SNDBUF values and expect TCP to just work.
Recent patches to address CVE-2019-11478 broke them in case of losses, since re-transmits might be prevented.
To (temporarily) fix this issue, I increased
SO_SNDBUF value in
socket options = TCP_NODELAY IPTOS_LOWDELAY SO_KEEPALIVE SO_RCVBUF=65536 SO_SNDBUF=65536
In the GRUB menu, select the kernel to edit and press
Go to the line starting with
linux16 and replace
rw init=/sysroot/bin/sh. Press
Ctrl+x to boot in single user mode.
To access the system type
passwd to change root password or
pam_tally2 to unlock the account.
Exit and reboot.
/etc/dnf/dnf.conf file, adding these parameters in the
proxy_password are optional, based on your proxy server configuration.
git remote set-url origin ssh://[new_host]/[git_path]
You can also edit manually the
config file in the
url = ssh://firstname.lastname@example.org/store/git/docs.git
fetch = +refs/heads/*:refs/remotes/origin/*