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1500 questions
51
votes
6 answers

Why do we still have such small email attachment filesize restrictions?

What's the technical limitation preventing us, in the glorious year 2011, from emailing each other 1GB files? Or is it just the main email platforms dragging their feet? If I can set my inbox to grab headers only, and then full attachments if I want…
Drew
  • 661
51
votes
3 answers

Disable the public key check for rpm installation

I want to make a DVD with some useful packages (for example php-common). The only problem is that if I try to install on a computer that's not connected to internet, I can't validate the public key. The scenario is like this: I download the RPMs,…
zozo
  • 823
51
votes
7 answers

How to remove IIS/ASP.NET Response Headers

I have a couple IIS/6.0 servers that security is asking me to remove a couple of response headers that are sent to client browsers on requests. They are concerned about divulging platform information through response headers. I have removed all the…
Astra
  • 683
51
votes
14 answers

Is there any way to get APT to install packages to my home directory?

Is there any way to get APT to install packages to my home directory? I don't want to make changes system wide. Alternatively, are there any home-directory based linux package managers?
Joel McCracken
51
votes
6 answers

Postfix: Recipient address rejected: User unknown in local recipient table

When I try to send an email on my postfix server to an address on the same domain (for example, if the server hostname is mail.example.com and I try to send an email to test@example.com), I get the following error in the log and the email is not…
Tai Squared
  • 669
51
votes
7 answers

How do I sudo over sshfs?

On my local host alpha I have a directory foo that is mapped via sshfs to host bravo as follows: $ sshfs charlie@bravo:/home/charlie ~/foo However, on host bravo there is another user, delta, that I want to sudo /bin/su as, so that I can do work in…
dirtside
  • 1,621
51
votes
5 answers

What's the difference between a Layer 2 & Layer 3 switch

What's the difference between a Layer 2 & Layer 3 switch? I've always wondered and never needed to know until now.
Jon Rhoades
  • 5,017
50
votes
6 answers

How do I back up an AWS S3 Bucket without versioning the source bucket

Is there any way to recover from accidental deletions of an Amazon S3 Bucket? We've got critical info in our buckets and I need to mitigate the risk of accidental or malicious deletions of the bucket itself. I know I can sync the entire bucket…
Nikhil Gupte
50
votes
14 answers

This could be due to CredSSP encryption oracle remediation - RDP to Windows 10 pro host

Error Following Windows security updates in May 2018, when attempting to RDP to a Windows 10 Pro workstation the following error message is displayed after successfully entering user credentials: An authentication error occurred. The function…
scott_lotus
  • 1,089
50
votes
12 answers

Docker pull: TLS handshake timeout

I get this consistenly (Ubuntu 16.04 LTS): $ docker pull nginx Using default tag: latest Error response from daemon: Get https://registry-1.docker.io/v2/: net/http: TLS handshake timeout However curl TLS works fine (apart from the auth error): $…
Willem
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50
votes
3 answers

Use HTTP/2.0 between nginx reverse-proxy and backend webserver

I use nginx as a reverse-ssl-proxy in front of a backend webserver that is capable of doing HTTP/2.0. I noticed that nginx proxies the requests to the backend server via HTTP/1.1 rather than HTTP/2.0. Is it possible to tell nginx to use an…
S1lentSt0rm
  • 1,079
50
votes
4 answers

Can someone using the same DNS server as me hijack my domains?

When I register a new domain, I send it to my hosting provider by assigning it its domain name servers in the registar's settings. For example, with Digital Ocean, I input the…
Eran Galperin
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50
votes
3 answers

Is there a maximum subdomain depth?

Is there a maximum allowed subdomain depth supported by webservers or browsers? For example, could a domain like foo.bar.baz.monkey.pirate.google.com cause problems?
braveterry
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50
votes
5 answers

How do I schedule a reboot on Linux?

I'd like to be able to schedule a server reboot at a specific time, but not regularly. How can I do this without futzing with adding and removing cron entries?
jldugger
  • 14,462
50
votes
2 answers

How to verify an imported GPG key

I'm new to this PGP thing. Here are my questions: Verification When I do this, I'm given the message "This key is not certified with a trusted signature". Is there anyway to make it trusted and better yet what's the proper way for doing…
user192702
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