This issue hasn't occurred to me before this week, so maybe there were some changes to the code that have caused this bug to occur. I've seen posts from the past with people describing similar issues and wondered if there is any word on a fix.

As far as I can tell, GOG 2.0 will state there is an error connecting to the PSN, but I can connect to PSN through their services with no issue.

The problem may lie with two-step verification as I have that activated and when I go through GOG, the option doesn't appear, so I believe that this could be the cause of connection errors.

Same here, error reads: "A connection to the server could not be established.
(18.bef31502.1587123399.15a5aeba)". I already connected my PSN account, but changed my password. Upon reconnecting I am prompted with the same error. I disabled two-factor login without results.

I, too, am experiencing this issue. I have verified that I can log in using my web browser. I have tried using a VPN. I have tried disabling my network-level ad blocker.

A connection to the server could not be established.
(18.c6e54d17.1587228186.97603a3)

Is Sony blocking GOG Galaxy from connecting?

Same here, for like a week.

A connection to the server could not be established.
(18.24edef50.1587245816.13c19a40)

Still no luck, unfortunately.

I'm having the same symptom. I've made sure to double check my firewall settings, I've made sure to test the username and password on all other browsers. It seems to be associated with the limited browser that is a part of GoG. Perhaps it has an additional need to be cleared by a firewall? Is it another executable? It sure behaves like it's being blocked before even going to the website cause it is instantly blocked with the above messages.

Windows 10, GoG 2.0 (latest version and rollbacks). I've tried uninstalling and reinstalling and that is a pain as well since it does nothing to remedy the issue.

Has anybody had any luck with this? I'm getting 18.95243717.1588866123.3fc866f3 as an error, I haven't changed my password or even have 2FA enabled and just started getting this error today.

Same here, I think it is a PSN or a GOG problem

Same issue. I found forum results of this happening back in December, too.

I am pretty sure it is a PSN problem. I tried connecting my battle.net account with PSN and got the exact same error code. Came here trough google.

Well in this case try the steps given and check if this works for you. Navigate and scroll down to Settings-> Account Management-> Sign Out and log out of your account. Please turn off your PlayStation entirely and try switching it on after some time. Then log into your account a new and start using it.
If this won’t works for you then try connecting to different server or else rebuild the PlayStation database.

pcerror-fix.com/playstation-network-sign-in-failed