Allow Firefox & Chrome To Access Restricted Ports
Read Time:1 Min, 42 Sec
When separating WebLogic E1 JAS instances we usually end up using odd port numbers. Sometimes, we use ports that have been put on a restricted list by both Firefox and Chrome.
Below is a list of the ports that are blocked and the service that is the reason for it being blocked:
| 1 – tcpmux | 7 – echo | 9 – discard | 11 – systat |
| 13 – daytime | 15 – netstat | 17 – qotd | 19 – chargen |
| 20 – ftp data | 21 – ftp control | 22 – ssh | 23 – telnet |
| 25 – smtp | 37 – time | 42 – name | 43 – nicname |
| 53 – domain | 77 – priv-rjs | 79 – finger | 87 – ttylink |
| 95 – supdup | 101 – hostriame | 102 – iso-tsap | 103 – gppitnp |
| 104 – acr-nema | 109 – POP2 | 110 – POP3 | 111 – sunrpc |
| 113 – auth | 115 – sftp | 117 – uucp-path | 119 – NNTP |
| 123 – NTP | 135 – loc-srv / epmap | 139 – netbios | 143 – IMAP2 |
| 179 – BGP | 389 – LDAP | 465 – SMTP+SSL | 512 – print / exec |
| 513 – login | 514 – shell | 515 – printer | 526 – tempo |
| 530 – courier | 531 – chat | 532 – netnews | 540 – uucp |
| 556 – remotefs | 563 – NNTP+SSL | 587 – submission | 601 – syslog |
| 636 – LDAP+SSL | 993 – IMAP+SSL | 995 – POP3+SSL | 2049 – nfs |
| 4045 – lockd | 6000 – X11 |
For more detail about this you can visit Mozilla’s website.
We ended up using ports 81-89. As you can see in the table above, port 87 is listed because of a service called “ttylink“. Below are the steps that you can take to “whitelist” any port you want. However, I would recommend not using the list of restricted ports. It is much easier than going through these steps with all of your users or maintaining a Windows Group PolicyWindows Group Policy.
Firefox:
- Type the following URL into Firefox: about:config
- Create a string setting called: network.security.ports.banned.override
- Give your new setting a value of “87”. You can also include a comma separated list, a range or a combination of both: 87, 150-300, 350, 400, 450-500
Chrome:
- Modify your shortcut to Chrome by changing the “Target” field to look something like:
“C:\Program Files (x86)\Google\Chrome\Application\chrome.exe”
–explicitly-allowed-ports=87
Average Rating