Check this:
https://www.mql5.com/en/forum/172133
https://www.mql5.com/en/articles/498
https://www.metatrader5.com/en/terminal/help/market/market_buy
https://www.mql5.com/en/forum/431841#comment_41767464

- www.metatrader5.com
It appears that i'm unable to connect to the market
I've downloaded EAs in the past, with no problems, now it started to not go thru, tried another EA, downloaded it, then stopped working again.
I tinkered with varius things, error 443, tried the "pure" version of the terminal (the other one is linked to the broker i'm using) and it says error 12175
i don't know where to wrap my head around, maybe i will try to download everything on my other computer, thank you anyway @Carl Schreiber
i will keep you posted in case i find a solution.
-Update 1: i started an old laptop, downloaded MT4 thru my broker and what do you know, market works, i will keep posting for my main pc.
-Update 2: the market on my main pc and on my laptop literally does not appear anymore, the space where it was is empty white, i don't know what to do, should i open a ticket?
It appears that i'm unable to connect to the market
I've downloaded EAs in the past, with no problems, now it started to not go thru, tried another EA, downloaded it, then stopped working again.
I tinkered with varius things, error 443, tried the "pure" version of the terminal (the other one is linked to the broker i'm using) and it says error 12175
i don't know where to wrap my head around, maybe i will try to download everything on my other computer, thank you anyway @Carl Schreiber
i will keep you posted in case i find a solution.
-Update 1: i started an old laptop, downloaded MT4 thru my broker and what do you know, market works, i will keep posting for my main pc.
-Update 2: the market on my main pc and on my laptop literally does not appear anymore, the space where it was is empty white, i don't know what to do, should i open a ticket?
- Update 3: yesterday, after 5 day, magically the problem resolved itself, now i can download and/or use any ea on the market, the problem is: is MT4 reliable? I don't know anymore, i'll let you decide.
Maybe it was related to this ...
Forum on trading, automated trading systems and testing trading strategies
MT4 broker server search no longer working in Windows 2012 R2?
Brandon S, 2022.11.11 22:15
It is resolved now. Thanks Metaquotes!
SSLLabs test shows updated/changed and working now.

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Hello, is anyone else having similar problems? I searched on the forum but didn't find anythin relevant.
I was looking for some Free EAs to download and test, but i was getting errors, so i turned off the firewall and downloaded the latest internet explorer, now I'm getting a different type of error:
MQL4 Market: failed to get of info purchase (send request failed [12175])
is it common? how can it be fixed? Hoping to help others with similar problems.
Thank you.