What is the forum message "your attachment failed security checks..."

[DC1MC]

I think it's the third or forth time lately when I've got images crashing the whole post because of this message  , it seem to be occurring often lately, could someone kindly please tell me what must an image have or not have to pass this checks so I can adjust my Gimp settings ?
And maybe adjust the little windows that appear when one clicks on the blue ? mark thingie that describes the attachments options to include the security rules.

 Thanks,
 DC1MC

[Bud]

Try changing image format, if you get the error with jpg try png.

[ataradov]

This is some sort of a bug, but nobody could be bothered to look into that. So dancing with slight image resizing and changing of the format is required.

[EEVblog]

Re this error message.
Gnif made some forum changes that should have fixed the other attachment wrong issue issue, so maybe it may have fixed this as well?

[David Hess]

I thought that message was because the forum was blocking attachments from identified VPNs, so it depends on the source IP or maybe reverse DNS.

[DC1MC]

I thought that message was because the forum was blocking attachments from identified VPNs, so it depends on the source IP or maybe reverse DNS.

That is not right, first I didn't use any VPN and the IP is from a German residential DSL IP block and second, if one fiddles with the compression ratios of the pictures and resubmit, they will pass. It's probably some pattern based filter.

[EEVblog]

I thought that message was because the forum was blocking attachments from identified VPNs, so it depends on the source IP or maybe reverse DNS.

I haven't heard that.
It's happened to me and I wasn't usign an VPN, so can't be that.

[David Hess]

I thought that message was because the forum was blocking attachments from identified VPNs, so it depends on the source IP or maybe reverse DNS.

I haven't heard that.
It's happened to me and I wasn't usign an VPN, so can't be that.

That is not what I said.  The common way to block VPNs is by IP or maybe reverse DNS, but it is common for IPs to be misidentified.  Ask someone who receives a group of IPs which were previously used for some other purpose who then finds themselves blocked from email or other services.  It is a recurring problem for people who want to operate their own email server and I run across servers which block access from VPNs pretty regularly, including fucking Google who blocked access to my secure email address and never restored it so I lost access to everything tied to that email account.

Next time I happens to me here, I can verify if it is based on IP.

[beanflying]

This has been happening without a VPN and seems to have been linked to an SMF issue that Gnif tweaked a few days ago 

https://www.eevblog.com/forum/chat/website-error-reports/msg3395360/#msg3395360