i created a subdomain and used it for a couple of days, posting a few things. had some problems with caching which caused new posts to overwrite old ones. today i had a completely new problem: i could not access ANY wordpress subdomains at all. i looked at the firewall traffic log and noticed that after each TCP request there was a ICMP packet 3/4 from my ISP that was being blocked (by default, i didn't cause it). i created a rule to allow them and now it's working. is this a problem with my ISP or is wordpress doing something weird?
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wordpress subdomains inaccessible if ICMP blocked
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