What a coincidence - I got the same set of errors early this morning (UK GMT time).
Where are you located as that would explain the difference in the time-stamps???
My 'Telegram' connection is working fine now.
I suspect it was a server or routing error?
>
> 24 Jan 03:50:28 - [warn] [telegrambot-config:914c2389.49b27] Unknown error. Trying again.
> 24 Jan 03:50:29 - [warn] [telegrambot-config:914c2389.49b27] ETELEGRAM: 502 Bad Gateway
> 24 Jan 03:50:29 - [warn] [telegrambot-config:914c2389.49b27] Unknown error. Trying again.
> 24 Jan 03:50:48 - [warn] [telegrambot-config:9ffef5c9.fa037] ETELEGRAM: 500 Internal server error: restart
> 24 Jan 03:50:48 - [warn] [telegrambot-config:9ffef5c9.fa037] Unknown error. Trying again.
> 24 Jan 03:50:50 - [warn] [telegrambot-config:9ffef5c9.fa037] ETELEGRAM: 429 Too Many Requests: retry after 5
> 24 Jan 03:50:50 - [warn] [telegrambot-config:9ffef5c9.fa037] Unknown error. Trying again.