On Sat, Nov 11, 2023 at 5:08 PM <fedora@xxxxxxxxxxxxxx> wrote: > > Since the middle of the night on 7/Nov, uploading files with ssh is problematic. > > My SMTP server requires SSL/TLS security, and uploading files to the same site requires sftp. > So both run over ssh. > > I have a few scripts that run from cron and send me mail when required. > They also upload some files for other people and for me when I am away from home. > > Now here is the problem. Small files pass though just fine. Using sftp I measured > that files up to 1300 bytes upload, but anything larger hangs. Large mail is also blocked, > queued as seen in mailq: > (timeout writing message to xxxx.xxxx.net.au.: Connection timed) > > It seems that after some time (often hours) things resolve. > Rebooting the machine also allows the mail through. > > Scripts that upload larger files (using lftp) hang for hours. > > Now I tested the same from a laptop over 4G and it does not show any of these problems. > So it is probably not at the receiving end (I also asked them). > All they see is occasional timeouts on mail and ssh (from me). > > I cannot figure what can do this. Small files upload OK larger ones hang??? > > I said earlier "middle of the night" because I was not at my computer then and > nothing of note that I could see, but the problems started showing in the logs. > > There is still the possibility of my ISP fiddling with the modem remotely (in the > past they did it around this time). I am chasing them. > > One thing that can help now is a way to un-hang the uploads without having to reboot. > I do not know where to even look. Well, SMTP is store and forward. The MUA or MTA will keep retrying until it times out (perhaps several days later). So it seems like restarting the service might be a good choice. I'm not sure which service to restart. I would start with the SSH or SFTP server. > Some details: > > The modem uses 4G for wireless internet. > > I used a laptop wired to my server, then wired to the modem, then connected to my WiFi ap > (which is wired to the modem) and all hang on large(ish) uploads. > > Only when I connected the laptop to my phone (as a WiFi ap) things worked well. > > BTW, one thing I did was disable ipv6 but the problem persists. Jeff _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
