Port restricted by Google Firefox, Google Firefox

Port restricted by Google Firefox, Google Firefox

Recently, in a new project, a new port is opened for testing. The port number is 6666, but Firefox and Google browsers cannot access it.

Firefox prompts the following:

This address uses a port that is usually used for browsing outside the network. For security reasons, Firefox canceled the request.

Google prompts:

Unable to display this webpage ERR_UNSAFE_PORT

Then I began to doubt whether it was a port problem. The result was changed to 8090, and Google's browser was able to access it normally. I thought it might be that Google's browser restricted some ports, and then Baidu went down, google Chrome restricts the following ports:

Some port numbers restricted by Google Firefox: 1: // tcpmux7: // echo9: // discard11: // systat13: // daytime15: // netstat17: // qotd19: // chargen20: // ftp data21: // ftp access22: // ssh23: // telnet25: // smtp37: // time42: // name43: // nicname53: // domain77: // priv-rjs79: // finger87: // ttylink95: // supdup101: // hostriame102: // iso-tsap103: // gppitnp104: // acr-nema109: // pop2110: // pop3111: // sunrpc113: // auth 115: // sftp117: // uucp-path119: // nntp123: // NTP135: // loc-srv/epmap139: // netbios143: // imap2179: // BGP389: // ldap465: // smtp + ssl512: // print/exec513: // login514: // shell515: // printer526: // tempo530: // courier531: // chat532: // netnews540: // uucp556: // remotefs563: // nntp + ssl587: // stmp? 601 ://?? 636: // ldap + ssl993: // ldap + ssl995: // pop3 + ssl2049: // nfs3659: // apple-sasl/PasswordServer4045: // lockd6000: // X116665: // Alternate IRC [Apple addition] 6666: // Alternate IRC [Apple addition] 6667: // Standard IRC [Apple addition] 6668: // Alternate IRC [Apple addition] 6669: // Alternate IRC [Apple addition]

This ...... be careful not to step on the pit!