Community tab (to login) is located in Tools - Options - Community:

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if you can login in past but could not do it now so you va check host file, for example:
Forum on trading, automated trading systems and testing trading strategies
can not login MQL5with my MT4 and Google too
Sergey Golubev, 2024.09.05 06:17
I think it may be related to host file -
- host file (website is showing something wrong): this thread https://www.mql5.com/en/forum/458988
- decision (solved): #8 and #14 and #3
more:
- hosts file: the thread (English),
- post #3 with instruction about HowTo.
2026.01.31 08:54:18.816 MQL5 community Authorization failed
Comments that do not relate to this topic, have been moved to "Off-topic posts".
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I'm unable to log in to MQL5 from my MT5 server; it displays "Login failed." However, I can log in through the MQL5 website. How can I resolve this issue?
Log message: 2026.01.30 16:01:40.864 MQL5 Marketplace unable to retrieve user product list (raw - read failed, 10054 wsa error, 1 byte required) [1009]
Yesterday I could log in, but I couldn't download metrics; today I can't log in at all.
Please take a look, thank you.