I know this is an older version, but it looks like you misconfigured your nginx on the migration

 

forge-1.7.10-10.13.4.1614-1.7.10

 

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Powered By MCP:           

http://modcoderpack.com/   

Searge, ProfMobius, Fesh0r,

R4wk, ZeuX, IngisKahn, bspkrs

MCP Data version : unknown

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:extractMcpData UP-TO-DATE

:getVersionJson

:extractUserDev UP-TO-DATE

:genSrgs SKIPPED

:extractNatives UP-TO-DATE

:getAssetsIndex

:getAssets

:makeStart

[ant:javac] warning: [options] bootstrap class path not set in conjunction with -source 1.6

[ant:javac] 1 warning

:downloadMcpTools FAILED

 

FAILURE: Build failed with an exception.

 

* What went wrong:

Execution failed for task ':downloadMcpTools'.

> java.io.IOException: Server returned HTTP response code: 500 for URL: http://files.minecraftforge.net/fernflower-fix-1.0.zip

 

* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

 

BUILD FAILED

 

Total time: 11.399 secs

Update to 1.9.4.