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Not always. Different ISP's block different things and work/home connections also have different rules.

Once I came home to find they blocked the port to SSH & VPN. After 1 month of fighting with the IT management in the local building they opened it again.

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Yep! The Great Firewall is only the outermost layer of blocking inside China. The ISP blocks plenty: only last week they suspended my account for a few days, probably as a "threat". It seems officials develop connections with the ISP's to collect surfing histories of customers these officials have an interest in. There's no concept of "providing an internet service to customers" in the minds of the ISP managers. If you use a Chinese ISP for any sort of web-hosting, be aware it may be vandalized by anyone willing to pay 100 rmb (i.e. 15 US dollars).

Run your OpenSSH server on port 80 or 443.

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