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Added paragraph on troubleshooting connectivity problems to redis over IPv6

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David André 2015-12-03 15:18:03 +01:00
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administration/README.md
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@ -371,3 +371,14 @@ This will give you a top 10 table per ip and username:
| 13.14.15.16 | SYSTEM | 16 |
+----------------+----------------------------------+------+
```
#### Troubleshooting MISP not connecting to redis but redis-cli working
If you have an IPv6 enabled OS, but an older redis version that does not support IPv6 (<v2.8), MISP might fail to connect to the redis server while redis-cli is working.
The reason is that redis-cli is connecting to 127.0.0.1 directly, while the calls inside the CakeResque library used by MISP are done using "*localhost*" which resolves both to the IPv4 and IPv6 loopback addresses. For some reasons, the use of the IPv6 address is attempted first which fails.
You can confirm this by trying to connect to redis using **telnet localhost 6379**. If it fails, the error message should mention the IPv6 loopback address (::1).
Two ways to fix it:
1) Upgrade your redis to a server that supports IPv6 (v2.8+). This is the preferred recommendation.
2) Comment the localhost mapping to IPv6 address in /etc/hosts